Denlinger LC, King TS, Cardet JC, Craig T, Holguin F, Jackson DJ, Kraft M, Peters SP, Ross K, Sumino K, Boushey HA, Jarjour NN, Wechsler ME, Wenzel SE, Castro M, Avila PC. Vitamin D Supplementation and the Risk of Colds in Patients with Asthma. Am J Respir Crit Care Med. 2016 Mar 15; 193(6):634-41.