1. Cryobiology Research Institute, Methodist Hospital of Indiana, Inc., 1701 N. Senate Blvd., Indianapolis, IN, 46206-1367, USA
2. Departments of Physiology/Biophysics and Obstetrics and Gynecology, School of Medicine, Indiana University, Indianapolis, IN 46222, USA
3. Department of Clinical Science, School of Veterinary Medicine, Purdue University, West Lafayette, IN 47907, USA