1. Department of Environmental Sciences; School of Life and Environmental Science; Azabu University; Sagamihara Japan
2. Department of Anatomy II; Graduate School of Veterinary Sciences; Azabu University; Sagamihara Japan
3. School of Veterinary Medicine; Azabu University; Sagamihara Japan
4. Graduate School of Medicine; Kyoto University; Kyoto Japan
5. Laboratory of Animal Reproduction; Graduate School of Veterinary Sciences; Azabu University; Sagamihara Japan