[1] St Pauls Hosp, Dept Endocrinol & Metab, Vancouver, BC V6Z 1Y6, Canada
[2] Univ British Columbia, Vancouver, BC V5Z 1M9, Canada
[3] Univ Victoria, Victoria, BC, Canada
[4] Vanderbilt Univ, Sch Med, Nashville, TN 37212 USA
[5] St Georges Univ, St Georges, Grenada
[6] Univ Calgary, Calgary, AB, Canada
[7] Dartmouth Coll, Hanover, NH 03755 USA