Perineal healing and survival after anal cancer salvage surgery: 10-year experience with primary perineal reconstruction using the vertical rectus abdominis myocutaneous (VRAM) flap - Sunesen,K.G.; Buntzen,S.; Tei,T.; Lindegaard,J.C.; Nørgaard,M.; Laurberg,S. (Ann Surg Oncol, 2009)