PER3 variable number tandem repeat (VNTR) polymorphism modulates the circadian variation of the descending pain modulatory system in healthy subjects - Carvalho, Fabiana; Pedrazzoli, Mario; Gasparin, Assunta; Santos, Franciele dos; Zortea, Maxciel; Souza, Andressa; Torres, Iraci da Silva Lucena; Fregni, Felipe; Caumo, Wolnei (Scientific Reports, 2019)