Is extreme obesity a risk factor for increased in-hospital mortality and postoperative morbidity after cardiac surgery? Results of 2251 obese patients with BMI of 30 to 50 - Syrakas, C A; Neumaier-Prauser, P; Angelis, I; Kiask, T; Kemkes, B M; Gansera, B (Thorac Cardiovasc Surg, 2007)