title: The district/practice mix.
authors.affiliation: Birmingham Health Authority.
authors.forename: A
authors.initials: A
authors.lastname: Obeid
mesh_terms: D002983:Clinical Competence; D005194:Family Practice; D006801:Humans; D007587:Job Description; D009722:Nurse Practitioners / Q000600:supply & distribution*; D009740:Nursing Staff / Q000600:supply & distribution*; D011637:Public Health Nursing; D000078329:Workforce