1. Department of Obstetrics; Gynaecology and Reproduction; Faculty of Veterinary Science; Chulalongkorn University; Bangkok Thailand
2. Department of Veterinary Technology; Faculty of Veterinary Technology; Kasetsart University; Bangkok Thailand
3. Department of Anatomy; Faculty of Veterinary Science; Chulalongkorn University; Bangkok Thailand
4. Department of Anatomy; Faculty of Veterinary Medicine; Kasetsart University; Bangkok Thailand