Physical activity, calcium intake and childhood bone mineral: a population-based cross-sectional study.
Harvey NC, Cole ZA, Crozier SR, Kim M, Ntani G, Goodfellow L, Robinson SM, Inskip HM, Godfrey KM, Dennison EM, Wareham NJ, Ekelund U, and Cooper C
Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA. Nov 2010
(DOI : 10.1007/s00198-011-1641-y)