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Martini CJ, Clayden AD, Turner ID. A comparison of three systems of classifying presenting problems in general practice. J R Coll Gen Pract. 1977;27(177):236-40
Martini, C. J., Clayden, A. D., & Turner, I. D. (1977). A comparison of three systems of classifying presenting problems in general practice. The Journal of the Royal College of General Practitioners, 27(177), 236-40.
Martini, C J, et al. "A comparison of three systems of classifying presenting problems in general practice." The Journal of the Royal College of General Practitioners vol. 27,177 (1977): 236-40.
Martini CJ, Clayden AD, Turner ID. A comparison of three systems of classifying presenting problems in general practice. J R Coll Gen Pract. 1977 Apr;27(177):236-40. PMID: 859156; PMCID: PMC2157994.
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