1. Metroplex Clinical Research CenterDallasTexas
2. Universidade Federal do ParanáCuritibaBrazil
3. Hospital Clinico Universitario de SantiagoSantiago de CompostelaSpain
4. Pfizer Inc.GrotonConnecticut
5. Pfizer Inc.CollegevillePennsylvania
6. Pfizer Inc.New YorkNew York