Footnotes

• This is the 15th paper in a series of Injury Classics. Our goal is to reprint one or two such papers in each issue to introduce newcomers to these old, often quoted, and important contributions. As many are difficult to find, it should help all of us to have a copy at hand. Your suggestions about future articles are welcome. Write to the editor with details of your favourite, most quoted paper.

• Some findings of a national questionnaire inquiry carried out by a Joint Committee of the Royal College of Obstetricians and Gynaecologists, the Population Investigation Committee and the Institute of Child Health (University of London) with the aid of a grant from the Nuffield Foundation.

• This paper first appeared in the Journal of Hygiene (now Epidemiology and Infection) (1950;48:323–37OpenUrl) and is reproduced with the permission of Cambridge University Press.