multicentre in British English
or US multicenter (ˌmʌltɪˈsɛntə)
adjective1. Also: multicentral comprising or involving several centres
2. (of a clinical study or trial) involving more than one clinic, medical centre, or other institution
Over 600 patients participated in multicenter double-blind studies in France, Germanyand Italy at 13 hospitals, three universities and four research facilities.