1. Research and Advanced Studies Center of the National Polytechnic Institute, CINVESTAV IPN,México
2. Hospital of México Federico Gomez,Department of Pediatric Surgery,México
3. Institute of applied sciences (ICAT), National Autonomous University,UNAM,México
4. Technological Institute of Morelia,Department of Electronic Engineering,Morelia,México
5. University Hospital “Dr. José E. González” Autonomous University of Nuevo León,Dep. Pediatrics,Monterrey,México
6. UAEM,Faculty of Engineering,Toluca,México