The effects of vitamin D₂ or D₃ supplementation on glycaemic control and related metabolic parameters in people at risk of type 2 diabetes: protocol of a randomised double-blind placebo-controlled trial.
Menon RK, Rickard AP, Mannan N, Timms PM, Sharp SJ, Martineau A, Boucher BJ, Chowdhury TA, Griffiths CJ, Griffin SJ, Hitman GA, and Forouhi NG
BMC Public Health. Nov 2012
(DOI : 10.1186/1471-2458-13-999)