1. Experimental Surgery I.O.R., Via di Barbiano 1/10, University of Bologna, 40100 Bologna, Italy
2. Institute of Histology and Embriology, Via Belmeloro 8, University of Bologna, 40100 Bologna, Italy
3. Institute of Human Morphology, Faculty of Medicine, Via P. Ranieri, University of Ancona, 60131 Ancona, Italy
4. Dermatology Clinic, L.go Cappelli 1, University of Ancona, 60100 Ancona, Italy