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Janner, Marco; Ballinari, Pietro; Mullis, Primus E.; Flueck, Christa E. (2010). High prevalence of vitamin D deficiency in children and adolescents with type 1 diabetes. Swiss medical weekly, 140, w13091. Muttenz: EMH Schweizerischer Ärzteverlag 10.4414/smw.2010.13091