by Epner, Janet E. Gans, Jonas, Harry S, Seckinger, Daniel L
Published in JAMA : the journal of the American Medical Association (26.08.1998)

by Sigman, Garry, Silber, Tomas J., English, Abigail, Gans Epner, Janet E.
Published in Journal of adolescent health (01.12.1997)

by Epner, J E, Levenberg, P B, Schoeny, M E
Published in Archives of pediatrics & adolescent medicine (01.08.1998)

by Grimes, David A
Published in JAMA : the journal of the American Medical Association (07.07.1999)