Are 25(OH) vitamin D and salivary-IgA risk factors for illness in Olympic athletes?. (January 2017) - Praet, Stephan; Vlahovich, Nicole; Hughes, David; Colbey, Candice; Manzanero, Silvia; Welvaert, Marijke; West, Nic; Pyne, David; Waddington, Gordon; Drew, Michael