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Annals of Epidemiology > 1997 > 7 > 7 > 440-445
Annals of Epidemiology > 1997 > 7 > 2 > 87-94
Journal of Pain and Symptom Management > 1995 > 10 > 6 > 432-435
Annals of Epidemiology > 1997 > 7 > 7 > 440-445
Annals of Epidemiology > 1997 > 7 > 2 > 87-94
Journal of Pain and Symptom Management > 1995 > 10 > 6 > 432-435