Determinants of outpatient expenditure within primary care in the Brazilian National Health System - Turi, Bruna Camilo; Codogno, Jamile Sanches; Sarti, Flávia Mori; Anokye, Nana Kwame; Fernandes, Rômulo Araújo; Monteiro, Henrique Luiz (São Paulo Medical Journal, 2017)