Maternal kangaroo care for neonatal pain relief: a systematic narrative review - Warnock, Fay F.; Castral, Thaila Corrêa; Brant, Rollin; Sekilian, Maria; Leite, Adriana Moraes; Owens, Sylvia de la Presa; Scochi, Carmen Gracinda Silvan (Journal of Pediatric Psychology, 2009)