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2. Trends in mortality from uterine cancer in relation to mass screening;Cristopherson;Acta Cytol,1977
3. Survey Procedures and Interpretive Guidelines for Laboratories and Laboratory Services, Appendix C, State Operations Manual. Springfield, VA, US Department of Commerce, Department of Health and Human Services publication number PB 92-146174. [NTIS 703-487-4650, 800-336-4700], 1993
4. Medicare, Medicaid and CLIA Programs; CLIA Fee Collection; Correction and Final Rule. (42 CFR 493). Federal Register;January 19,1993
5. Canadian experience in cytology proficiency testing;Thompson;Acta Cytol,1989