title: Analgesic drugs combinations in the treatment of different types of pain.
authors: Laboratorio de Farmacología, Área Académica de Medicina del Instituto de Ciencias de la Salud, Universidad Autónoma del Estado de Hidalgo, Eliseo Ramírez Ulloa 400, Col. Doctores, 42090 Pachuca, HGO, Mexico.
authors: Mario I
authors: MI
authors: Ortiz
authors: María Asunción Romero
authors: MA
authors: Molina
authors: Young-Chang P
authors: YC
authors: Arai
authors: Carlo Luca
authors: CL
authors: Romanò