Karen Frances B. Mason, MD, FPCP, DPSE Gastroenterology Clinic Schedule: By Appointment See also different: Aprilyn T. Gagtan, MDJoeffrey L. Zales, MDJubila Araceli B. De Guzman, MD, FPCP, FPSEDMMichelle Melendez, MD, DPBS, FPFGS, FSOFT, FPCSRonillo A. Instrella, MD, FPAMS, FPSD<< return to doctors