Deep sedation during gastrointestinal endoscopy: Propofol-fentanyl and midazolam-fentanyl regimens - Santos, Marcos Eduardo Lera dos; Maluf-Filho, Fauze; Chaves, Dalton Marques; Matuguma, Sergio Eiji; Ide, Edson; Luz, Gustavo de Oliveira; Souza, Thiago Ferreira de; Pessorrusso, Fernanda Cristina Simões; Moura, Eduardo Guimarães Hourneaux de; Sakai, Paulo (World Journal of Gastroenterology, 2013)