1. M. Köhler, B. Hirschberg, C. T. Bond, J. M. Kinzie, N. V. Marrion, J. P. Adelman, Vollum Institute, L-474, Oregon Health Sciences University, 3181 Southwest Sam Jackson Road, Portland, OR 97201, USA.
2. J. Maylie, Department of Obstetrics and Gynecology, Oregon Health Sciences University, Portland, OR 97201, USA.