Please refer to this study by its ClinicalTrials.gov identifier: NCT00046449
| Study Site |
| Homer, Alaska, United States, 99603 |
| Study Site |
| New Haven, Connecticut, United States, 06504-0605 |
| Study Site |
| Newark, Delaware, United States, 19713 |
| Study Site |
| Wilmington, Delaware, United States, 19808-1251 |
| Study Site |
| Washington, District of Columbia, United States, 20016 |
| Study Site |
| Washington, District of Columbia, United States, 20037 |
| Study Site |
| Boise, Idaho, United States, 83704 |
| Study Site |
| Libertyville, Illinois, United States, 60048 |
| Study SIte |
| Northfield, Illinois, United States, 60093 |
| Study SIte |
| Chicago, Illinois, United States, 60610 |
| Study Site |
| Hoffman Estates, Illinois, United States, 60194 |
| Study Site |
| Chicago, Illinois, United States, 60612 |
| Study Site |
| Schaumburg, Illinois, United States, 60194 |
| Study SIte |
| Greenwood, Indiana, United States, 46143 |
| Study Site |
| Indianapolis, Indiana, United States, 45202 |
| Study Site |
| Florence, Kentucky, United States, 41042 |
| Study Site |
| Wellesley Hills, Massachusetts, United States, 02481 |
| Study Site |
| Okemos, Michigan, United States, 48864 |
| Study Site |
| Royal Oak, Michigan, United States, 48067 |
| Study Site |
| Minneapolis, Minnesota, United States, 55454 |
| Study Site |
| Piscataway, New Jersey, United States, 08854 |
| Study Site |
| Moorestown, New Jersey, United States, 08057 |
| Study Site |
| Williamsville, New York, United States, 14221 |
| Study Site |
| Lawrence, New York, United States, 11559 |
| Study Site |
| Staten Island, New York, United States, 10305 |
| Study Site |
| Olean, New York, United States, 14760 |
| Study Site |
| New York, New York, United States, 10021 |
| Study Site |
| New York, New York, United States, 10021 |
| Study Site |
| Amityville, New York, United States, 11701 |
| Study Site |
| Cleveland, Ohio, United States, 44121 |
| Study Site |
| Cleveland, Ohio, United States, 44106 |
| Study Site |
| Cincinnati, Ohio, United States, 45219 |
| Study Site |
| Lyndhurst, Ohio, United States, 44124 |
| Study Site |
| Toledo, Ohio, United States, 43623 |
| Study Site |
| Independence, Ohio, United States, 44131 |
| Study Site |
| Salem, Oregon, United States, 97309 |
| Study Site |
| Portland, Oregon, United States, 97201 |
| Study Site |
| Eugene, Oregon, United States, 97401 |
| Study Site |
| Portland, Oregon, United States, 97209 |
| Study Site |
| Philadelphia, Pennsylvania, United States, 19106 |
| Study Site |
| Allentown, Pennsylvania, United States, 18104 |
| Study Site |
| Philadelphia, Pennsylvania, United States, 19107 |
| Study Site |
| Lincoln, Rhode Island, United States, 02865-4208 |
| Study Site |
| Seattle, Washington, United States, 98104 |
| Study Site |
| West Allis, Wisconsin, United States, 53227 |
| Study Site |
| Middleton, Wisconsin, United States, 53562 |
| Study Site |
| Madison, Wisconsin, United States, 53719 |
| Study Site |
| Milwaukee, Wisconsin, United States, 53226 |
| Study Site |
| Edmonton, Alberta, Canada, T6G 2C8 |
| Study Site |
| Vancouver, British Columbia, Canada, V6Z 1Y6 |
| Study Site |
| Miramichi, New Brunswick, Canada, E1V 3G5 |
| Study Site |
| Sydney, Nova Scotia, Canada, B1S 2E8 |
| Study Site |
| Markham, Ontario, Canada, L6B 1A1 |
| Study Site |
| Mississauga, Ontario, Canada, L4W 1N2 |
| Study Site |
| Hull, Quebec, Canada, J9A 1K7 |