American Journal of Obstetrics and Gynecology Editors

American Journal of

Obstetrics and Gynecology

Editors

Editors FREDERICK P. ZUSPAN, Editor in Chief Donna L. Stroud, Managing Editor E.J. QUILLIGAN, Editor in Chief Sandra Perrine, Managing Editor RICHARD C. BUMP, Associate Editor STEVEN G. GABBE, Associate Editor THOMAS J. GARITE, Associate Editor JAY D. IAMS, Associate Editor MOON H. KIM, Associate Editor ALBERTO MANETTA, Associate Editor LARRY SACHS, Statistical Consultant

Advisory committee on policy Janice Bacon Linda Brubaker Ken Burry Robert C. Cefalo Bryan Cowan Stephen Cruikshank John DeLancey W. Patrick Duff James Ferguson Murray Freedman A. Jerome Freeland

Norman F. Gant Melvin Gerbie Ronald S. Gibbs W. Glenn Hurt Robert Israel Marilyn K. Laughead Charles Lockwood Robert S. Mannel James N. Martin, Jr Joseph Montella Eberhard Mueller-Heubach

D. Michael Nelson Peggy A. Norton Mark Phillipe Robert Schenken Gerald Shefren Robert Shull Cheryl Smart Thomas Stovall Paul Tomich Gerson Weiss Thomas K. Young

Board of corresponding editors John Bonnar, Dublin, Ireland

Gunnar Lose, Glostrup, Denmark

Jacob Bornstein, Haifa, Israel

Eduardo Lopez de la Osa, Madrid, Spain

Gian Carlo Di Renzo, Perugia, Italy

Raaga Mansour, Cairo, Egypt

Guillermo Focaccia, Neuquén, Patagonia,

Enrique Oyarzun, Santiago, Chile Bernhard Schuessler, Lucerne, Switzerland

Argentina Mary Hannah, Toronto, Ontario, Canada

Chan Ho Song, Seoul, Korea

Tsuyomu Ikenoue, Miyazaki, Japan

Henk C. S. Wallenburg, Rhoon,

Ian R. Johnson, Nottingham, England

The Netherlands

Marita Kuhnert, Marburg, Germany

Don Wilson, Dunedin, New Zealand

Publisher MOSBY, INC, 11830 Westline Industrial Dr, St Louis, MO 63146-3318 Sue Schulz, Senior Production Editor

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February 2003

American Journal of Obstetrics and Gynecology