?:authorAffiliation
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[\'Center for Health Outcomes and Policy Research at the University of Pennsylvania School of Nursing, 418 Curie Boulevard, Fagin Hall, Philadelphia, PA 19104-06021, USA. Electronic address: frenchra@nursing.upenn.edu.\', \'NEXT Harm Reduction, USA.\', \'National Clinician Scholars Program, University of Pennsylvania, 13th Floor Blockley Hall, 423 Guardian Drive, Philadelphia, PA, 19104-6021, USA.\']
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