Karen Frances B. Mason, MD, FPCP, DPSE Gastroenterology Clinic Schedule: By Appointment See also different: Allan D. Corpuz, MD, FPCP, DPRACatherine C. Guerrero, MDCharmaine Almojuela-Mique, MDChester O. Directo, MD, DPCPMa. Ana C. Tolentino, MD, FPCP, FPSG, FPSDE<< return to doctors