Picavet, H. S.J.∗; Schouten, J. S.A.G.
National Institute of Public Health and the Environment, Center for Chronic Diseases Epidemiology (CZE, pb 101), PO box 1, 3720 BA Bilthoven, The Netherlands
∗Corresponding author. Tel.: +31-30-2743-063; fax: +31-30-2744-407
E-mail: [email protected]
Submitted September 10, 2001; revised September 5, 2002; accepted September 20, 2002.
doi: 10.1016/s0304-3959(02)00372-x