1 Department of Anesthesia and Intensive Care, Cardiothoracic Center, Istituto Clinico Sant'Ambrogio, Gruppo Ospedaliero San Donato, University and Research Hospitals, Milan, Italy; Department of Cardiac Surgery, University of Milan, Milan, Italy.
2 Department of Minimally Invasive Cardiac Surgery, Cardiothoracic Center, Istituto Clinico Sant'Ambrogio, Gruppo Ospedaliero San Donato, Milan, Italy.
3 Department of Minimally Invasive Cardiac Surgery, Cardiothoracic Center, Istituto Clinico Sant'Ambrogio, Gruppo Ospedaliero San Donato, Milan, Italy. Electronic address: antoniomiceli79@alice.it.