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