1. Orthopedic Surgery Department, Pediatric Upper Extremity Surgery and Microsurgery; Hospital Sant Joan de Deu. Passeig Sant Joan de Deu, 2; Esplugues de Llobregat 08950 Spain
2. Hand and Microsurgery Unit; Hospital Universitari Quiron-Dexeus; ICATME. Carrer Sabino de Arana, 5-19, Barcelona 08028 Spain
3. Orthopedic Surgery Department; Hand Surgery Unit; Hospital Universitari Vall d'Hebron; Passeig Vall d'Hebron 119-129, Barcelona 08035 Spain
4. Human Anatomy and Embryology Department, Faculty of Medicine; Universitat Autònoma de Barcelona; Barcelona Spain