Coffee consumption and heart rate variability: the Brazilian Longitudinal Study of Adult Health (ELSA-Brasil) cohort study - Oliveira, Rackel Aguiar Mendes de; Araújo, Larissa Fortunato; Figueiredo, Roberta Carvalho de; Goulart, Alessandra Carvalho; Schmidt, Maria Ines; Barreto, Sandhi Maria; Ribeiro, Antonio Luiz Pinho (Nutrients, 2017)