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|volume=336
|pages=1197-1201
|url=https://www.nejm.org/doi/10.1056/NEJM199704243361701?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub%20%200www.ncbi.nlm.nih.gov
|pubmedCID=9110906
|DOI=10.1056/NEJM199704243361701