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3. Secondary sex characteristics of boys 12–17 years of age: The U.S. Health Examination Survey;Harlan;J Pediatr,1979
4. Plan and operation of a Health Examination Survey of U.S. youths 12–17 years of age;National Center for Health Statistics;Public Health Service Pub. No. 1,000-Series,1969
5. Age at menarche, United States;National Center for Health Statistics;Vital and Health Statistics, Series,1973