Paul S Echlin1
, Ross EG Upshur2,3,4
, Douglas B McKeag5
and Harsha P Jayatilake6 
1
Providence Athletic Medicine, Providence Hospital and Medical Centers, 47601 Grand River Avenue, Suite 101, Novi Michigan, United States of America 48374
2
Primary Care Research Unit, Department of Family and Community Medicine, Sunnybrook and Women's College Health Sciences Centre, 2075 Bayview Avenue, #E-349, Toronto, Ontario, Canada M4N 3M5
3
Department of Family and Community Medicine, University of Toronto, 263 McCaul Street, Toronto, Ontario, Canada M5T 1W7
4
Department of Public Health Sciences, University of Toronto, 12 Queen's Park Crescent W., Toronto, Ontario, Canada M5S 1A8
5
Department of Family Medicine, Indiana University, Long Hospital, Second Floor. 1110 West Michigan Street, Indianapolis Indiana, United States of America 46202-5102
6
Department of Family Medicine, Wayne State University, 15400 West McNichols, 2nd Floor, Detroit, Michigan, United States of America 48235