1. Merck & Co., Inc., 2015 Galloping Hill Road, Kenilworth, New Jersey 07033, United States
2. Alectos Therapeutics Inc., 8999 Nelson Way, Burnaby, British Columbia V5A 4B5, Canada
3. Pharmaron Beijing Co. Ltd., 6 Taihe Road, BDA, Beijing 100176, P. R. China