Randomized trial of vitamin D supplementation to prevent seasonal influenza A in schoolchildren
Autore: Mitsuyoshi Urashima, Takaaki Segawa, Minoru Okazaki, Mana Kurihara, Yasuyuki Wada, and Hiroyuki Ida.
American Journal of Clinical Nutrition
Randomized trial of vitamin D supplementation to prevent seasonal influenza A in schoolchildren