In collaboration with the Yale Bariatric Surgery Program and General Surgery Department, patients will be identified as 18-years-of-age or older seeking body-contouring procedures (including panniculectomy and abdominoplasty) following massive weight loss or those patients in need of complex abdominal wall reconstruction (i.e. ventral hernia repair) and breast reconstruction necessitating the use of acellular dermal matrix. For the timeframe outlined in this protocol, the Section of Plastic Surgery at Yale performs surgeries in excess of the required numbers needed for this study, ensuring timely completion.