Health of Adolescents and Youths in the Americas

abuse accidents activities adoles adolescencia adolescent medicine adolescent unit adolescente adult age group alcohol anorexia nervosa areas axillary hair behavior birth body boys Brazil breast Buenos Aires causes of death Center cents changes characteristics child Chile circulatory system clinical countries cultural diagnosis diseases disorders drug effects evaluation factors feel females frequently genital genital herpes girls gonorrhea greater growth herpes hormone hospitalized adolescents important increase individual infections Latin America lescent males marijuana maturation menarche ment method Mexico Mexico City mortality mothers needs normal Nursing obesity olescent oral contraceptive parents peasant Pediatrics physical physician population pregnancy present problems programs psychological psychosocial puberty pubic hair Querétaro risk São Paulo secondary sexual development social stage suicide syphilis Tanner teenagers tion tive treatment users vitamin weight women World Health Organization York young youngsters youth