CYP2R1 polymorphisms are important modulators of circulating 25-hydroxyvitamin D levels in elderly females with vitamin insufficiency, but not of the response to vitamin D supplementation. - Arabi, A.; Khoueiry-Zgheib, N; Awada, Z.; Mahfouz, R.; Al-Shaar, L.; Hoteit, M.; Rahme, M.; Baddoura, R.; Halabi, G.; Singh, R.; El Hajj Fuleihan, G. (Osteoporosis International, 2017)