Yates T, Griffin S, Bodicoat DH, Brierly G, Dallosso H, Davies MJ, Eborall H, Edwardson C, Gillett M, Gray L, Hardeman W, Hill S, Morton KL, Sutton S, Troughton J, and Khunti K
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(DOI : 10.1186/s13063-015-0813-z)