Antonio Miceli1, Lorenzo Di Bacco2, Francesco Donatelli3, Mattia Glauber2. 1. Minimally invasive Cardiac Surgery Department, Istituto Clinico Sant'Ambrogio, Italy. Electronic address: antoniomiceli79@alice.it. 2. Minimally invasive Cardiac Surgery Department, Istituto Clinico Sant'Ambrogio, Italy. 3. Chair of Cardiac Surgery, Department of Clinical and Community Sciences, University of Milan, Italy.