1. Department of Orthopaedic Surgery and Hip Arthroscopy, Hospital Herrera Llerandi , 6A avenida 8-71, Guatemala City, Guatemala
2. Department of Adult Hip and Knee Reconstruction, Instituto Nacional de Rehabilitacion LGII , Calz. México Xochimilco No. 289 Col. Arenal de Guadalupe, Mexico City C.P.14389, Mexico
3. Department of Hip Preservation Surgery, Centro de Especialidades Ortopedicas , Av. Mariana de Jesús OE7-02 y Nuño de Valderrama P.B, Quito, Ecuador
4. Department of Sports Medicine and Arthroscopy, Hospital Central Dr. Ignacio Morones Prieto , Avenida Venustiano Carranza No. 2395, San Luis Potosi C.P. 78290, Mexico
5. Department of Orthopaedic Surgery, Hospital Medica Sur SA , Puente de Piedra 150, Toriello Guerra, Tlalpan, Mexico City C.P. 14050, Mexico