Title page(s)
Key passage(s)
Translation
Translation
Whole article
Download the full article as a PDF (full text of the translated paper as well as separate commentaries by J Rosser-Matthews, N Black, U Tröhler, and JP Vandenbroucke)
Acknowledgements
The editors are grateful to:
The Editors of the International Journal of Epidemiology for permission to reproduce the translation of the original article, and to link to the commentaries on the paper published in their journal.