Vitamin D Status Among Children With Juvenile Idiopathic Arthritis: A Multicenter Prospective, Non-randomized, Comparative Study oleh Elena I. Kondratyeva, Elena I. Kondratyeva, Nuriniso D. Odinaeva, Leonid Ya Klimov, Nadeshda S. Podchernyaeva, Natalya I. Ilenkova, Svetlana V. Dolbnya, Elena K. Zhekaite, Elena K. Zhekaite, Victoria A. Kuryaninova, Yuliya V. Kotova, Margarita I. Tikhaya, Elena P. Shitkovskaya, Liubov V. Bychina, Tamara G. Drepa, Aisa E. Zodbinova, Yuliya L. Melyanovskaya, Yuliya L. Melyanovskaya, Nika V. Petrova, Elena V. Loshkova, Sergei I. Kutsev