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The Hospice Journal|January 1, 1990
Social support: the experience of hospice family caregiversJ M Kirschling, V P Tilden, P G Butterfield
AAOHN Journal : Official Journal of the American Association of Occupational Health Nurses|April 1, 1995
Design of a questionnaire: occupational and environmental risks for Parkinson's diseaseP G Butterfield, C A Lindeman, B G Valanis, et al.
American Journal of Industrial Medicine|November 17, 1998
Low back pain: predictors of absenteeism, residual symptoms, functional impairment, and medical costs in Oregon workers' compensation recipientsP G Butterfield, P S Spencer, N Redmond, et al.
Neurology|June 1, 1993
Environmental antecedents of young-onset Parkinson's diseaseP G Butterfield, B G Valanis, P S Spencer, et al.
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