title: Methodological Issues on a Clinical Trial to Test Tapentadol Prolonged release vs. Oxycodone/Naloxone Prolonged release.
authors.affiliation: Faculty of Medicine, University of Habana, La Habana, Cuba.
authors.forename: Jorge
authors.initials: J
authors.lastname: Bacallao
authors.forename: Alfonso J
authors.initials: AJ
authors.lastname: Casado