1 LISiN, Politecnico di Torino, Via Cavalli 22 H, 10138, Torino, Italy. roberto.merletti@polito.it.
2 Clinica San Pio X, Milan, Italy. diriva@tiscali.it.
3 Department of Business Economics, Health and Social Care, University of Applied Sciences and Arts of Southern Switzerland (SUPSI), Manno, Switzerland. corrado.cescon@supsi.ch.
4 Department of Obstetrics and Gynecology, Riga Stradins University, Riga, Latvia. vita.zacesta@gmail.com.