Wald David S, Wald Nicholas J
Wolfson Institute of Preventive Medicine, Barts and the London School of Medicine, Queen Mary University of London, Charterhouse Square, London EC1M 6BQ, United Kingdom.
Prev Med. 2011 Jan;52(1):16-7. doi: 10.1016/j.ypmed.2010.11.015. Epub 2010 Dec 2.