1. Department of Pediatric Orthopaedics, Sanatorio Allende, Córdoba, Argentina
2. Department of Pediatric Orthopaedics, Hospital Roberto del Río
3. Department of Pediatric Orthopaedics, Clínica Alemana, Santiago
4. Department of Pediatric Orthopaedics, Universidad Austral de Chile, Valdivia, Chile
5. Department of Pediatric Orthopaedics, Hospital del Trabalhador, Curitiba, Brazil
6. Division of Orthopaedic Surgery, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, USA