title: Single subject trials in primary care.
authors.affiliation: Department of General Practice, Health Centre, Llanederyn, Cardiff CF23 9PN, UK. francisna@cardiff.ac.uk
authors.forename: N A
authors.initials: NA
authors.lastname: Francis
mesh_terms: D002986:Clinical Trials as Topic / Q000379:methods*; D019317:Evidence-Based Medicine; D005194:Family Practice; D018401:Sample Size; D015983:Selection Bias