Mass mailing and staff experience in a total recruitment program for a clinical trial: the SHEP experience. Systolic Hypertension in the Elderly Program. Cooperative Research Group.
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N. Borhani | J. Probstfield | H. Petrovitch | T. Vogt | P. Borhani | L. Lovato | G. Bailey | A. Wilson | S. Krieger | N. Cosgrove | J. Levin | M. Hoffmeier | V. Breeson