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Journal of Behavioral Medicine > 1998 > 21 > 5 > 451-467
European Journal of Epidemiology > 1997 > 13 > 7 > 787-793
Journal of Behavioral Medicine > 1998 > 21 > 5 > 451-467
European Journal of Epidemiology > 1997 > 13 > 7 > 787-793