RT Journal Article SR Electronic T1 Rational prescribing: the principles of drug selection and assessment of efficacy JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP 26 OP 28 DO 10.7861/clinmedicine.5-1-26 VO 5 IS 1 A1 Derek G Waller YR 2005 UL http://www.rcpjournals.org/content/5/1/26.abstract AB