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Cals JWL, de Bock L, Beckers PJ, Francis NA, Hopstaken RM, Hood K, de Bont EGPM, Butler CC, Dinant G-J. Consultation rates and antibiotic prescribing in patients managed by clinicians using C-reactive protein and trained in enhanced communication skills: 3.5-year followup of a cluster randomised trial. Ann Fam Med 2013;11:157-64.