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Έκδοση 1983
Full text available from ABI/INFORM Global: 01/01/1995 to 10/31/2005
Full text available from Healthcare Administration Database: 01/01/1995 to 10/31/2005
Full text available from Research Library: 01/01/1995 to 10/31/2005
Ηλεκτρονική πηγή Επιστημονικό περιοδικό