United States. The 22-hour procedure was the largest and most complex face transplant in the world; 80 percent of the patient’s face was transplanted. The female patient had suffered severe facial trauma. The transplant team led by Maria Siemionow, MD, PhD, Director of Plastic Surgery Research and Head of Microsurgery Training. Video courtesy of Cleveland Clinic … face transplant facial trauma cleveland clinic siemionow disfigurement surgery dermatology plastic-surgery microsurgery …