The influence of biphasic positive airway pressure vs. sham biphasic positive airway pressure on pulmonary function in morbidly obese patients after bariatric surgery oleh Aikaterini N. Alexandropoulou, Konstantinos Louis, Alexandros Papakonstantinou, Konstantinos Tzirogiannis, Elissavet Stamataki, Charis Roussos, Manos Alchanatis, Christina Gratziou, Emanouil Vagiakis, Konstantinos Roditis