{. Lutz, P. Pury, G. Fioretta, und L. Raymond. European Journal of Cancer Prevention: The Official Journal of the European Cancer Prevention Organisation (ECP), 13 (1):
77--81(Februar 2004)PMID: 15075792.
G. Alvarez, S. Harlow, C. Denman, und M. Hofmeister. Revista Panamericana De Salud Pública = Pan American Journal of Public Health, 25 (2):
120--127(Februar 2009)PMID: 19531306.