Serum 30-day dose-response test (+S30DR) to evaluate vitamin A deficiency among brazilian male adolescents - Ferraz, Ivan Savioli; Souza, Cristiane Simões Bento de; Martinelli Júnior, Carlos Eduardo; Del Ciampo, Luiz Antonio; Jordão Júnior, Alceu Afonso; Vannucchi, Hélio; Del Ciampo, Ieda Regina Lopes; Almeida, Carlos Alberto Nogueira de (Clinical Research in Pediatrics, 2018)