1. Center for Biomedical Engineering, Department of Medicine; Brigham and Women's Hospital Harvard Medical School; 65 Landsdowne Street Boston MA 02139 USA
2. Universidad San Francisco de Quito; School of Medicine, Building of Medical Specialities, Hospital de los Valles (HDLV), Av. Interoceánica Km 12½ - Cumbayá; Quito Ecuador
3. The University of Kansas; School of Engineering, Department of Chemical & Petroleum Engineering, 1530 W. 15th Street 66045 Lawrence; KS USA
4. Hospital Pablo Arturo Suarez; Department of Trauma and Orthopaedic Surgery, Angel Ludeña y Machala Oe5261; Quito Ecuador