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Longitudinal Aging Study Amsterdam
Aging research and collecting data on aging in the Netherlands

The Longitudinal Aging Study Amsterdam (LASA) is a scientific study to determine predictors and consequences of aging. Since 1991, LASA has studied the physical, emotional, cognitive and social functioning of the elderly in the Netherlands. Within LASA the interdependence of these domains of functioning and of the changes that occur over time is being investigated. In this respect LASA stands out from most other studies of aging.

What are you looking for?

Know more about LASA (Data collections)	Naar Nederlandse pagina's (Go to Dutch pages)
Google search within LASA	Search on topic (see below)
Search LASA publications	Submit a research proposal
Go to one of our THEMES:
BIOMATERIAL	CARE
COGNITIVE	DEMOGRAPHICS
EMOTIONAL	PHYSICAL
SOCIAL	WORK
Go to side studies	Ask a question to LASA

Watch a short video about LASA:

LASA video

On this page you can watch the LASA video (8 min 42 sec, or the short version 4 min 11 sec, both Dutch spoken with English subtitles).


LASA video: 8 min 42 sec	LASA video: 4 min 11 sec

Topic search in the LASA-documentation

Topic / File nr / Measurement instrument / Theme / Waves B-I, sorted on topic (in alphabetic order).

LEGEND

UC: Under Construction;
* : In wave C respondent and proxy interviews were the same, see under PROXY;
**: Not yet documented;
† (superscript): Blood pressure retests in wave B were processed in LASAB170;
IM (superscript): In 2004, three years after wave E an interim measurement was carried out on the first cohort, see the specific topics for more details. More information will follow.
Note: some of the data are not yet available (in red).

Topic	File nr	Wave► Theme ▼	B	C	D	E	2B	F	G	H	3B	MB	I	J
Adaptations and facilities		CAR	XX	XX	XX	XX	XX	XX	XX	XX	XX	XX	XX	XX
Adaptations in the house	014	SOC	B	C	D	E	2B	F	G	H	3B	-	I	J
Adipokines**	879	BIO	-	-	-	-	-	-	G	-	-	-	-
Adjustments and walking aids**	187	PHY	-	-	D	E	2B	F	G	H	3B	-	-
Advance directives	093	CAR	-	-	D	-	-	-	-	-	-	-	-
	195	CAR	-	-	-	-	-	F	G	H	-	-	I
	709	CAR	-	-	D	-	-	-	-	-	-	-	-
Advanced Care Planning (ACP)	108	CAR	-	-	-	-	-	-	-	-	-	-	I
Age at interview**	z008	DEM	B	C	D	E	2B	F	G	H	3B	MB	I
Age norms	070	EMO	B	C	D	-	2B	F	G	H	3B	-	I
Alcohol use^IM	153	PHY	B	C	D	E	2B	F	G	H	3B	MB	I
Allostatic Load (algorithm)		PHY	-	C	-	-	-	-	-	-	-	-	-
Anthropometry	161	PHY	B	C	D	E	2B	F	G	H	3B	MB	I
Anthropometry: Grip strength	161	PHY	-	C	D	E	2B	F	G	H	3B	MB	I
Anthropometry: Calf measurement	171	PHY	B	-	D	E	2B	F	G	H	3B	-	-
Anthropometry: Calf measurement	161	PHY	-	-	-	-	-	-	-	-	-	-	I
Anxiety		EMO
Anxiety diagnoses	d12/d13	EMO	B	-	D	E	3B	-	G	H	-	-	I
Anxiety symptoms (HADS-A)^IM	026	EMO	B	C	D	E	-	F	G	H	3B	MB	I
Aortic calcification	zo22	PHY	-	C	D	-	-	-	-	-	-	-	-
Apolipoprotein E (ApoE)	870	BIO	B	-	-	-	2B	-	-	-	-	-	-
Attention Deficit Hyperactivity Disorder (ADHD)	179	EMO	-	-	-	-	-	-	G	-	-	-	-
Attitudes about care	032	CAR	B	-	-	-	-	-	-	-	-	-	-
Attitudes about care	112	CAR	B	-	-	-	2B	F	G	H	3B	MB	I
Attitudes toward ageing	071	EMO	B	-	-	-	-	-	-	-	-	-	-
Back pain	182	PHY	-	C	D	E	-	-	-	-	-	-	-
Bedridden	182	PHY	-	C	D	-	-	F	G	H	3B	-	-
Bio-electrical impedance**	172	PHY	B	-	-	-	-	-	-	-	-	-	-
Birth weight	134	PHY	-	-	-	E	2B	-	-	-	3B	-	-
Blood collection and overview measurements/ Response blood sampling /DNA	850	BIO	B	C	-	-	2B	-	G	-	3B	-	-
Blood pressure / pulse (incl. retests)	151	PHY	B^†	C	D	E	2B	F	G	H	3B	MB	I
Body composition		PHY
Bone-related hormones and bone turnover	862	BIO	-	C	-	-	-	-	-	-	-	-	-
Cardiovascular diseases (algorithm)		PHY
Care evaluation (use of care)	033	CAR	B	C	D	E	2B	F	G	H	3B	MB	I
Children**	048	SOC	-	C	-	E	2B	F	G	-	3B	MB	I
Cholesterol, triglycerides and fructosamin	867	BIO	-	C	-	-	-	-	-	-	-	-	-
Chronic diseases		PHY
Chronic diseases (self- report of -)	035	PHY	B	C	D	E	2B	F	G	H	3B	MB	I
Chronic diseases	602	PHY	-	C	D	E	-	F	G	H	-	-	I
Chronic diseases	702	PHY	-	*	D	E	-	F	G	H	-	-	I
Church affiliation	(z)038	DEM	-	C	D	E	2B	-	-	-	3B	MB	-
Church attendance	(z)038	DEM	-	-	D	E	2B	F	G	H	3B	MB	I
Coding task	155	COG	B	C	D	E	2B	F	G	H	3B	-	I
COLIA1	871	BIO	-	C	-	-	-	-	-	-	-	-	-
Contact network	167	SOC	-	-	-	-	-	-	-	-	3B	MB	I
Contact with health and social services	044	CAR	B	C	D	E	2B	F	G	H	3B	MB	I
Contact with Wmo	178	CAR	-	-	-	-	-	-	G	H	-	-	I
Coping behavior**	147	EMO	-	-	-	-	-	F	-	-	-	-	-
Crystallized intelligence (GIT)	037	COG	-	C	-	-	-	F	-	-	-	-	I
Date blood sampling	851	BIO	B	C	-	-	2B	-	G	-	3B	-	-
Decisions in eol-situations	148	CAR	-	-	-	-	-	-	G	-	-	-	-
Decubitus (bedsores)	159	PHY	B	-	-	-	-	-	-	-	-	-	-
Decubitus (bedsores)	116	PHY	B	-	-	-	-	-	-	-	-	-	-
Dementia (probable)		COG	B	C	D	E	2B	F	G	H	-	-	-
Dementia parents	092	COG	-	-	D	-	2B	-	-	-	-	-	-
Dementia parents	708	COG	-	-	D	-	-	-	-	-	-	-	-
Dementia partner	139	COG	-	-	-	E	-	F	G	H	3B	-	I
Depression		EMO
Depression diagnoses	d10/d11	EMO	B	C	D	E	2B	F	G	H	3B	-	I
Depressive symptoms^IM	025	EMO	B	C	D	E	2B	F	G	H	3B	MB	I
	606	EMO	-	C	D	E	-	-	-	-	-	-	-
	706	EMO	-	*	D	E	-	F	G	H	-	-	I
Diabetes Mellitus	zdc1/zdc2	PHY	B	C	D	E	2B	F	G	-	-	-	-
Diet and food consumption	184	PHY	-	C	D	-	-	-	-	-	-	-	-
Diet and food consumption	118	PHY	B	C	D	-	-	-	-	H	-	-	I
Digit span	020	COG	-	-	-	-	-	-	-	-	3B	-	-
Digit span	166	COG	-	-	-	-	-	-	-	H	-	-	I
Dizziness^IM	187	PHY	-	C	D	-	2B	F	G	H	3B	-	I
Education	z004	DEM	B	-	-	-	2B	-	-	-	3B	MB	-
Employment and retirement	713	WOR	-	-	-	-	-	-	-	-	-	-	I	J
Employment status	016	WOR	B	C	D	E	2B	F	G	H	3B	MB	I
End of life care and preferences		CAR
Ethnicity**	z004	DEM	B	-	-	-	2B	-	-	-	3B	MB	-
EuroQol	135	PHY	-	-	-	E	-	F	G	H	3B	-	I
Evaluation of life		EMO
Everyday memory	023	COG	B	-	-	-	-	F	-	-	-	-	-
Executive functioning		COG
Exome Chip			-	C	-	-	-	-	G	-	-	-	-
Falls	605	PHY	-	C	D	-	-	-	-	-	-	-	-
Falls	705	PHY	-	*	D	-	-	-	-	-	-	-	-
Falls: circumstances and consequences	187	PHY	-	-	D	-	-	-	-	-	-	-	-
Falls: environmental conditions (in the home)**	180	PHY	-	C	D	-	-	-	-	-	-	-	-
Falls: fear of falling (FES: Falls Efficacy Scale)	183	PHY	-	C	D	-	-	-	-	-	-	-	-
Falls: last year	187	PHY	-	C	D	-	-	-	-	-	3B	MB	-
Feelings and wishes about life and death	127	CAR	-	-	-	-	-		-	-	-	-	I
Fertility women**	119	PHY	B	-	-	-	-	-	-	-	-	-	-
Fertility women**	181	PHY	-	C	-	-	2B	-	-	-	3B	MB	-
Filial responsibility expectations^IM	132	SOC	-	-	D	E	-	-	-	-	-	-	-
Fluid intelligence	024	COG	B	-	-	-	-	-	-	-	-	-	-
Fluid intelligence	022	COG	B	C	D	E	2B	F	G	-	-	-	-
Food supplements (see also Medication)	174	PHY	-	-	-	-	-	-	-	-	-	-	I
Foot problems	185	PHY	-	C	D	E	-	F	-	-	-	-	-
Fractures^IM	186	PHY	-	C	D	E	2B	F	G	H	3B	MB	I
	zo13	PHY	B	C	D	E	2B	F	-	-	-	-	-
	605	PHY	-	C	D	E	-	F	G	H	-	-	I
	705	PHY	-	*	D	E	-	F	G	H	-	-	I
Frailty (various definitions)		PHY	B	C	D	E	2B	F	G	H	3B	MB	I
Functional limitations (ADL)	030	PHY	B	C	D	E	2B	F	G	H	3B	MB	I	J
	603	PHY	-	C	D	E	-	F	G	H	-	-	I
	703	PHY	-	*	D	E	-	F	G	H	-	-	I
Gender**	z004	DEM	B	-	-	-	2B	-	-	-	3B	MB	-
General Self-regulation (GSR)**	149	EMO	-	-	-	-	-	-	G	H	-	-	-
Genetic polymorphisms (Haplotypes)	873	BIO	-	C	-	-	-	-	-	-	-	-	-
Genetic polymorphisms (Vitamin D Receptors)	872	BIO	-	C	-	-	-	-	-	-	-	-	-
Gerotranscendence	038	EMO	-	C	D	E	2B	F	-	-	-	-	-
GP-information	g00/01	PHY	B	C	-	E	-	F	-	-	-	-	-
GPJEM	016	WOR	B	C	D	E	2B	F	G	H	3B	MB	I
Grandchildren**	049	SOC	-	-	-	-	-	F	-	-	-	-	-
GWAS data		BIO	-	C	-	-	2B	-	G	-	3B	-	-
Head trauma	035	COG	-	-	D	E	-	F	G	H	-	-	I
	602	COG	-		D	E	-	F	G	H	-	-	I
	702	COG	-	-	D	E	-	F	G	H	-	-	I
Health care in country of origin	068	CAR	-	-		-	-	-	-	-	-	MB	-
Health insurance**	018	DEM	B	-	-	-	-	-	-	-	-	-	-
Hearing: Speech in Noise Questions	194	PHY	-	-	-	E	-	F	G	-	-	-	I
Hearing : Speech in Noise Test	193	PHY	-	-	-	E	-	F	G	-	-	-	I
Homocysteine cycle, vitamin B12, MMA	866	BIO	-	C	-	-	-	-	-	-	-	-	-
Hospital admission	045	CAR	B	C	D	E	2B	F	G	H	3B	MB	I
Household composition**^IM	011	DEM	B	C	D	E	2B	F	G	H	3B	MB	I
Housing characterics (general)	014	SOC	B	C	D	E	2B	F	G	H	3B	MB	I	J
Housing characterics (mortgage, etc.)	015	SOC	B	C	D	E	2B	F	G	H	3B	-	I	J
Humor	111	EMO	B	-	D	-	-	-	-	-	-	-	-
Hyperthyroidism**	182	PHY	-	C	D	-	-	-	-	-	-	-	-
Important aspects of life	110	EMO	B	C	D	E	2B	F	G	H	3B	-	I
Income	017	DEM	B	C	D	E	2B	F	G	H	3B	MB	I
Income decline and evaluation	019	DEM	B	C	D	E	2B	F	G	H	3B	MB	I
Inflammation factors	861	BIO	B	C	-	-	-	-	-	-	3B	-	-
Intelligence and cognition		COG
Intergenerational relationships		SOC
Investment in independence	144	EMO	-	-	-	-	-	F	G	H	-	-	I
IQCODE	607	COG	-	C	D	E	-	F	G	H	-	-	I
Last wishes	146	CAR	-	-	-	-	-	F	-	-	-	-	-
(Negative) life events^IM	272	EMO	-	C	D	E	-	F	G	H	-	-	I
Living arrangements		DEM
Loneliness	073	SOC	B	C	D	E	2B	F	G	H	3B	MB	I	J
Loneliness	712	SOC	-	-	-	-	-	-	-	H	-	-	I	J
Loneliness -existential**	173	SOC	-	-	-	-	-	-	-	-	-	-	-	J
Marital status and partner	z010	DEM	B	C	D	E	2B	F	G	H	3B	MB	I
Mastery	027	EMO	B	C	D	E	2B	F	G	H	3B	MB	I
Medical care indication	189	CAR	-	-	-	E	-	F	G	H	-	-	I
	610	CAR	-	-	-	-	-	F	-	-	-	-	-
	710	CAR	-	-	-	-	-	F	-	-	-	-	I
Medication and food supplement use (see also Food supplements)	152	PHY	B	C	D	E	2B	F	G	H	3B	MB	I
Memory: 15WT episodic memory	156	COG	B	C	D	E	2B	F	G	H	3B	-	I
Metabolic syndrome	ch02	PHY	-	C	-	-	-	-	-	-	-	-	-
Meta-emotion	029	EMO	B	-	-	-	-	-	-	-	-	-	-
Meta-emotion	143	EMO	-	-	-	-	2B	-	-	-	-	-	-
Metamemory	124	COG	B	C	D	-	-	-	-	-	-	-	-
MMSE	021	COG	B	C	D	E	2B	F	G	H	3B	MB	I
MMSE	707	COG	-	-	D	E	-	F	G	H	-	-	I
Memory complaints^IM	021	COG	B	C	D	E	2B	F	G	H	3B	MB	I
Mobility (limitations to -)**	183	PHY	-	C	D	E	-	-	-	-	-	-	-
Mortality data		DEM
Mortality and cause of death	z990	PHY
Need for affiliation	078	SOC	B	-	-	E	-	-	-	-	-	-	-
Need for affiliation	141	SOC	-	-	-	-	2B	-	G	-	-	-	-
Needs assessment (Wvg, Wmo, etc.)	177	CAR	-	-	-	-	-	-	G	H	-	-	I
Neigborhood characteristics	015	SOC	B	C	D	E	2B	F	G	H	3B	-	I	J
Neuroticsm and social inadequacy (Dutch Personality Questionnaire: DPQ/NPV)	123	EMO	B	C	D	E	2B	-	-	-	3B	-	-
(Non-)response**	(z)002	DEM	B	C	D	E	2B	F	G	H	3B	MB	I
Occupation	016	DEM	B	C	D	E	2B	F	G	H	3B	MB	I
Olfactory function (smell)	S00/01/02	PHY	-	-	-	-	-	-	-	-	3B	MB	-
Oral health	126	PHY	-	-	-	-	-	-	-	-	-	-	I
Orthodoxy / Religiousness	138	EMO	-	-	-	E	-	-	-	-	-	-	-
Osteoarthritis hip and knee (algorithm)	zoa1/2/3	PHY	B	C	D	E	2B	F	G	H	3B	-	I
Outpatient contact with medical specialists during last 6 months	045	CAR	B	C	D	E	2B	F	G	H	3B	MB	I
Pain drawing, dealing with pain	188	PHY	-	-	-	E	-	-	-	-	-	-	-
Pain: subjective^IM	115	PHY	B	C	D	E	2B	F	G	H	3B	MB	I
Parental data**	140	SOC	-	-	-	-	2B	-	-	-	3B	-	-
Parkinson: early P. related signs**	096	PHY	-	-	-	-	-	-	-	-	3B	MB	-
Partner questions**	139	SOC	-	-	-	E	-	F	G	H	3B	-	I
Peak flow (see also Spirometry)	158	PHY	B	C	D	E	-	-	G	H	-	-	-
Perceived body shape**	145	PHY	-	-	-	-	-	F	G	-	3B	MB	-
Perceived control of care	033	CAR	-	-	-	-	-	-	-	H	3B	MB	I
Perceived physical activity (LIVAS)	114	PHY	B	C	D	E	2B	F	-	-	-	-	-
Perceived self-efficacy (ALCOS)	028	EMO	B	C	D	E	2B	F	G	H	3B	-	I
Perceived stress	104	EMO	-	-	-	-		-	-	H	3B	-	-
Personal network	047	SOC	B	C	D	E	2B	F	G	H	3B	MB	I
Personality traits		EMO
Pets in household**	012	SOC	B	C	D	E	2B	F	G	H	3B	-	I	J
Physical activity	046	PHY	B	C	D	E	2B	F	G	H	3B	MB	I
Physical performance (tests)	034	PHY	B	C	D	E	2B	F	G	H	3B	MB	I
Posttraumatic stress disorder (PTSD)	091	EMO	-	-	D	E	-	-	-	-	-	-	-
Praying	038	EMO	-	C	D	E	2B	F	G	H	3B	-	I
Providing care	142	CAR	-	-	-	-	2B	F	G	H	3B	MB	I
Qualeffo-41	o80/81/82	PHY	-	-	-	E	-	-	-	-	-	-	-
Quality of life		PHY
Quantitative ultrasound of bone	o31	PHY	-	C	-	-	-	-	G	-	-	-	-
Religion / religiousness	038	EMO	-	C	D	E	2B	F	G	H	3B	-	I
Religious coping	038	EMO	-	-	-	-	-	-	-	-	-	MB	-
Religious coping	105	EMO	-	-	-	-	-	-	-	-	3B	-	-
Relocation	014	SOC	B	C	D	E	-	F	G	H	-	-	I	J
Relocation (owner)	015	SOC	B	C	D	E	-	F	G	H	-	-	I	J
Residence in 1944**	013	SOC	B	-	-	-	-	-	-	-	-	-	-
Residential care after attrition**	UC	CAR
Rheumatoid Arthritis (algorithm)	UC	PHY	-	C	-	-	-	-	-	-	-	-	-
Routine measurements	860	BIO	B	C	-	-	2B	-	G		3B	-	-
Salience of religion	608	EMO	-	C	-	-	-	-	-	-	-	-	-
Salivary cortisol (constructed)	882	BIO	-	-	-	E	-	-	-	-	-	-	-
Salivary cortisol (data categorization)	881	BIO	-	-	-	E	-	-	-	-	-	-	-
Salivary cortisol (non) response	880	BIO	-	-	-	E	-	-	-	-	-	-	-
Satisfaction with life and happiness (see also Subjective life expectancy)	110	EMO	B	C	D	E	2B	F	G	H	3B	-	I
Sedentary behavior	101	PHY	-	-	-	-	-	-	G	H	3B	MB	I
Self-esteem	027	EMO	B	C	D	E	2B	F	G	H	3B	-	I
Self-rated health (SRH)	036	PHY	B	C	D	E	2B	F	G	H	3B	MB	I
Self-rated health (GHPQ/RAND)	113	PHY	B	C	D	E	2B	F	G	H	3B	-	-
Senses	604	PHY	-	C	D	E	-	F	G	H	-	-	I
Senses	704	PHY	-	*	D	E	-	F	G	H	-	-	I
Serum 25-hydroxyvitamin D (25(OHD)D) and PTH	862	BIO	-	C	-	-	2B	-	G	-	3B	-	-
Serum Amyloid P component (SAP)	868	BIO	-	C	-	-	-	-	-	-	-	-	-
Serum cortisol	864	BIO	-	C	-	-	-	-	-	-	-	-	-
Sex hormones	863	BIO	-	C	-	-	-	-	-	-	-	-	-
Sexuality	120	EMO	B	-	-	E	2B	F	-	-	3B	-	-
SF-12 Health Survey	133	PHY	-	-	D	E	-	F	G	H	3B	-	I
Singing and making music	103	EMO	-	-	-	-	-	-	-	H	-	-	I
Sleep quality	117	EMO	B	C	D	E	2B	F	G	H	3B	-	I
Smoking^IM	154	PHY	B	C	D	E	2B	F	G	H	3B	MB	I
Social desirability**	130	SOC	-	C	-	-	-	F	-	-	-	-	-
Social identity**	131	SOC	-	-	D	E	-	-	-	-	-	-	-
Social Participation	070	SOC	B	C	D	E	2B	F	G	H	3B	MB	I
Social Participation	125	SOC	B	C	D	E	2B	F	G	-	-	-	-
Social Participation (environmental influence)**	121	SOC	B	C	D	-	-	-	-	-	-	-	-
Socio-economic status (SES)		DEM
Spirometry (see also Peak flow)	168	PHY	-	-	-	-	-	-	-	-	3B	-	-
Subjective life expectancy/subjective age	094	EMO	-	-	D	E	-	F	G	H	-	-	I
Thyroid function	865	BIO	-	C	-	-	-	-	-	-	-	-	-
Ties with country of origin**	069	SOC	-	-	-	-	-	-	-	-	-	MB	-
Urbanization (urban-rural)	z095	DEM	B	C	D	E	2B	F	G	H	3B	MB	I
Use of assistive devices or assistence	030	PHY	B	C	D	E	2B	F	G	H	3B	MB	I	J
Use of care (receiving help)	033	CAR	B	C	D	E	2B	F	G	H	3B	MB	I
Valuation of life	137	EMO	-	-	-	E	-	F	-	-	-	-	-
Values and norms**	122	SOC	B	C	D	E	2B	F	G	H	3B	-	I
Verbal fluency / word production	165	COG	-	-	-	-	-	-	-	H	3B	MB	I
Vertebral deformities	zo22	PHY	-	C	D	-	-	-	-	-	-	-	-
Vignettes about help	074	SOC	-	-	D	-	-	-	-	-	-	-	-
Vision & hearing	031	PHY	B	C	D	E	2B	F	G	H	3B	MB	I
Vision-related quality of life	192	PHY	-	-	-	E	-	F	G	H	-	-	-
Vision: contrast sensitivity	157	PHY	B	C	D	E	2B	F	-	-	-	-	-
Vision: visual acuity	191	PHY	-	-	-	E	-	F	G	H	3B	-	-
Vitamin K status	869	BIO	-	-	-	-	2B	-	-	-	-	-	-
Weight and height	161	PHY	B	C	D	E	2B	F	G	H	3B	MB	I
Weight and height history; weight change^IM	160	PHY	B	C	D	E	2B	F	G	H	3B	MB	I
Weight (change)	714	PHY	-	-	-	-	-	-	-	-	-	-	I
Weight factors (for comparisons)		DEM
WHO Quality of Life**	133	PHY	-	-	-	-	-	-	-	-	-	-	I
Widowhood	z410	DEM
Work and Retirement	016	WOR	B	C	D	E	2B	F	G	H	3B	MB	I
Work and Retirement	713	WOR	-	-	-	-	-	-	-	-	-	-	I	J
Work perception**	106	WOR	-	-		-	-	-	-	-	3B	MB	I
Worrying	136	EMO	-	-	-	E	-	-	-	-	-	-	-
Wvg-voorziening	611	CAR	-	-	-	-	-	-	G	H	-	-	I
Wvg-voorziening	711	CAR	-	-	-	-	-	-	G	H	-	-	I

LASA is carried out at the VU University (VU) and Amsterdam UMC, location VUmc (VU University Medical Center) and was initiated by the Ministry of Health, Welfare and Sport (VWS) in the Netherlands.

Aging research Netherlands

Longitudinal Aging Study Amsterdam Aging research and collecting data on aging in the Netherlands

Topic search in the LASA-documentation

Longitudinal Aging Study Amsterdam
Aging research and collecting data on aging in the Netherlands