Quirk J T, Berg S, Chinchilli V M, Johansson B, McClearn G E, Vogler G P
Department of Cancer Prevention, Epidemiology, and Biostatistics, Roswell Park Cancer Institute, A-334 Carlton House, Elm and Carlton Streets, Buffalo, NY 14263, USA.
J Epidemiol Community Health. 2001 Oct;55(10):746-7. doi: 10.1136/jech.55.10.746.