Understanding the link between early sexual initiation and later sexually transmitted infection: test and replication in two longitudinal studies.
Epstein M, Bailey JA, Manhart LE, Hill KG, Hawkins JD, Haggerty KP, Catalano RF. Understanding the link between early sexual initiation and later sexually transmitted infection: test and replication in two longitudinal studies. J Adolesc Health. 2014 Apr; 54(4):435-441.e2.