Fri 8:30 am - 5:00 pm. Sat 9:00 am - 11:15 am. Sun Closed. All of us at GMA strive to provide our patients with the best care possible. If you have any suggestions for improvement, please feel free to let us know. You may contact the practice manager directly by email at robin@gastonmedicalassociates.com or call her at 704-861-9030 ext 15.Publicforms‧Gaston Medical Associates PA.