In Patient Usability Testing Results of a Patient-Centered Postoperative Wound Surveillance Smart Phone App Utilizing Digital Photographs Andrea N. Mahnke, MS1; Sara Fernandes-Taylor, PhD2; Rebecca Gunther, MD2; Kate L. Baker, MA1; Jason T. Wiseman, MD2; K. Craig Kent, MD2 1Marshfield Clinic Research Foundation Biomedical Informatics Research Center, Marshfield, WI 2Department of Surgery, University of Wisconsin-Madison, Madison, WI.