Headache, Stomachache, Backache, and Morning Fatigue Among Adolescent Girls in the United States: Associations With Behavioral, Sociodemographic, and Environmental Factors. - Ghandour, Reem M.; Overpeck, Mary D.; Huang, Zhihuan J.; Kogan, Michael D.; Scheidt, Peter C. (Archives of Pediatrics & Adolescent Medicine, 2004)