Bioequivalence evaluation of single doses of two tramadol formulations: a randomized, open-label, two-period crossover study in healthy Brazilian volunteers - Silva, Marina de Freitas; Schramm, Simone Grigoleto; Kano, Eunice Kazue; Koono, Eunice Emiko Mori; Porta, Valentina; Serra, Cristina Helena dos Reis (Clinical Therapeutics, 2010)