Variability in baseline laboratory measurements of the Brazilian Longitudinal Study of Adult Health (ELSA-Brasil) - Ladwig, R; Vigo, A; Fedeli, Ligia Maria Giongo; Chambless, L E; Benseñor, Isabela M; Schmidt, M I; Vidigal, P G; Castilhos, C D; Duncan, B B (Brazilian Journal of Medical and Biological Research, 2016)