Anderson Kelly K, Sebaldt Rolf J, Lohfeld Lynne, Burgess Ken, Donald Faith C, Kaczorowski Janusz
Department of Clinical Epidemiology, McMaster University, Hamilton, ON, Canada.
Fam Pract. 2006 Aug;23(4):469-71. doi: 10.1093/fampra/cml013. Epub 2006 Apr 4.