[The effect of visits to the limestone caves in the municipality of Valkenburg in South Limburg on asthmatic diseases].
D001249:Asthma / Q000628:therapy*; D001991:Bronchitis / Q000628:therapy*; D002119:Calcium Carbonate; D059552:Caves; D006801:Humans
D002119:Calcium Carbonate
ASTHMA/therapy; BRONCHITIS/therapy