title: External validity & non-probability sampling.
authors.affiliation: Department of Community Medicine, Dr RP Government Medical College, Tanda 176 001, Kangra, Himachal Pradesh, India.
authors.forename: Sunil Kumar
authors.initials: SK
authors.lastname: Raina
mesh_terms: D006801:Humans; D007588:Job Satisfaction; D010820:Physicians / Q000523:psychology*