1. Laboratory of Veterinary Biochemistry and Immunology; College of Veterinary Medicine; Chungbuk National University; Cheongju; Chungbuk; Korea
2. Department of Obstetrics and Gynecology; College of Medicine; Soonchunhyang University; Bucheon; Korea
3. Department of Obstetrics and Gynecology; Child and Family Research Institute; Faculty of Medicine; University of British Columbia; Vancouver; British Columbia; Canada