Analysis of zinc and copper levels in very low birth weight infants using human milk additives: phase 1 trial findings Renata G. Oliveira; Maria C.A. Feih; Vicky Nogueira-Pileggi; Adriana Carnevale da Silva; Fabio Carmona; Davi C. Aragon; Mariana M. Oliveira; Luciana M.M. Fonseca; Larissa G. Alves; Vanessa S. Bomfim; Tânia M.B. Trevilato; Isabela S. Dias; Fabio V. Ued; Marisa M. Mussi-Pinhata; Jose S. Camelo;