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| Contact: Patient Recruitment and Public Liaison Office | (800) 411-1222 | prpl@mail.cc.nih.gov |
| Contact: TTY | 1-866-411-1010 |
| United States, California | |
| Stanford University | Recruiting |
| Stanford, California, United States, 94305-5584 | |
| United States, District of Columbia | |
| GW University Medical Center | Recruiting |
| Washington, District of Columbia, United States, 20037 | |
| United States, Maryland | |
| Suburban Hospital | Recruiting |
| Bethesda, Maryland, United States, 20814 | |
| Center for Sleep and Wake Disorders | Recruiting |
| Chevy Chase, Maryland, United States, 20815 | |
| United States, Massachusetts | |
| Harvard University | Recruiting |
| Boston, Massachusetts, United States, 02115 | |
| Canada | |
| McMaster University | Recruiting |
| Hamilton, Ontario, Canada | |
| China | |
| National Taiwan University | Recruiting |
| Taiwan, China | |
| Switzerland | |
| University of Zurich | Recruiting |
| Zurich, Switzerland | |