1. Wistar Institute of Anatomy and Biology, Philadelphia, Pennsylvania 19104
2. Department of Medicine, Aichi Medical University, Aichi-Ken, Japan.
3. Sinai Hospital of Baltimore, Inc., Baltimore, Maryland 21215
4. Department of Laboratory Animal Medicine, Bowman Gray School of Medicine, Winston-Salem, North Carolina 27103
5. South African Institute for Medical Research, Johannesburg, South Africa