Common variants in the calcium-sensing receptor gene are associated with total serum calcium levels.
O'Seaghdha CM, Yang Q, Glazer NL, Leak TS, Dehghan A, Smith AV, Kao WH, Lohman K, Hwang SJ, Johnson AD, et al. Hum Mol Genet. 2010 Nov 1; 19(21):4296-303. Epub 2010 Aug 12.