Characterization of bimodal chronotype and its association with sleep: a population-based study - Tempaku, Priscila Farias; Ramirez Arruda, Juliana; Mazzotti, Diego Robles; Gonçalves, Bruno S. B.; Pedrazzoli Neto, Mario; Bittencourt, Lia Rita Azeredo; Tufik, Sergio (Chronobiology International, 2017)