1. Hagey Laboratory for Pediatric Regenerative Medicine, Department of Surgery, Stanford University, School of Medicine, Stanford, California, USA
2. Dipartimento di Scienze Chirurgiche, Anestesiologiche‐Rianimatorie e dell'Emergenza “Giuseppe Zannini,” Universita' degli Studi di Napoli Federico II, Napoli, Italy
3. Institute for Stem Cell Biology and Regenerative Medicine, Stanford University, Stanford, California, USA