1. Backpack on schoolchildren's percepcions of load, associations with back pain and factors determining the load;Negrini;Spine,2002
2. Risk factors for the development of low back pain in adolescence;Feldman;Epidemiol,2001
3. The association of backpack use and back pain in adolescents;Sheeir-Neiss;Spine,2003
4. Las mochilas en los escolares y su asociación con el dolor de espalda;Ruano;Acta Médica Grupo Ángeles,2007
5. Non-specific back pain in children and adolescents: a prospective study until maturity;Mirovsky;Pediatric Orthop B,2002