Bovet P, Lob M
Soz Praventivmed. 1976 Jul-Aug;21(4):128-9. doi: 10.1007/BF01994455.
A study on lead pollution was carried out on a sample of ca. 300 city children. This paper presents the errors producing bias in the sample. It is emphasized that, in Switzerland, the difference between the Swiss and the migrant population (the latter being mainly Italian and Spanish) must be taken into account.
