1. Department of Biomathematics, Faculty of Medicine, University of Thessaly, Larissa, Greece.
2. Department of Nephrology, Faculty of Medicine, University of Thessaly, Larissa, Greece.
3. 1st University Department of Urology, Laiko General Hospital, National and Kapodistrian Athens University, Athens, Greece.
4. The Institute for Clinical Research and Health Policy Studies, Tufts Medical Center, Tufts University School of Medicine, Boston, Massachusetts.