Physical activity levels and hepatic steatosis: a longitudinal follow-up study in adults - Gerage, Aline Mendes; Ritti-Dias, Raphael Mendes; Balagopal, P Babu; Conceição, Raquel Dilguerian de Oliveira; Umpierre, Daniel; Santos, Raul D; Cucato, Gabriel Grizzo; Bittencourt, Márcio Sommer (Journal of Gastroenterology and Hepatology, 2018)