Physicians

Click on each physician's name for a detailed biography and contact information.

  • Patrick R. Volak, M.D., F.A.C.P.

  • Markham L. Nightengale, M.D.

  • Douglas B. Kliewer, M.D.

  • Paul D. Stanton, M.D.

  • Gary L. Hills, D.O.

  • Matt M. Blankenship, M.D.

  • Brandon A. Conkling, D.O.

  • Christian D. Clark, M.D.

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    • Physicians
    • Patrick R. Volak, M.D., F.A.C.P.
    • Markham L. Nightengale, M.D.
    • Douglas B. Kliewer, M.D.
    • Paul D. Stanton, M.D.
    • Gary L. Hills, D.O.
    • Matt M. Blankenship, M.D.
    • Brandon A. Conkling, D.O.
    • Christian D. Clark, M.D.

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    • Physicians
      • Patrick R. Volak, M.D., F.A.C.P.
      • Markham L. Nightengale, M.D.
      • Douglas B. Kliewer, M.D.
      • Paul D. Stanton, M.D.
      • Gary L. Hills, D.O.
      • Matt M. Blankenship, M.D.
      • Brandon A. Conkling, D.O.
      • Christian D. Clark, M.D.
    • Procedures and Services
      • Capsule Endoscopy
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      • Williams Medical Plaza
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    Adult Gastroenterology Associates | Four Locations: Tulsa, OK | P: (918) 481-4700

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