Correspondence Points: Simple principles of epidemiology Br Med J (Clin Res Ed) 1985; 291 doi: https://doi.org/10.1136/bmj.291.6492.415-d (Published 10 August 1985) Cite this as: Br Med J (Clin Res Ed) 1985;291:415 Article Related content Metrics Responses Peer review Related articles Correction Potential hazard of clotting during blood transfusion using a blood warming pack Published: 31 August 1985; Br Med J (Clin Res Ed) 291 doi:10.1136/bmj.291.6495.607-h See more Introductory Address Prov Med Surg J October 03, 1840, s1-1 (1) 1-4; DOI: https://doi.org/10.1136/bmj.s1-1.1.1 Report of the Meeting of the Eastern Branch of the Provincial Association at Bury St. Edmond's Prov Med Surg J October 03, 1840, s1-1 (1) 10-13; DOI: https://doi.org/10.1136/bmj.s1-1.1.10 Mr. Warburton's Bill for the Regulation of the Medical Profession Prov Med Surg J October 03, 1840, s1-1 (1) 13-15; DOI: https://doi.org/10.1136/bmj.s1-1.1.13 An Atlas of Plates, illustrative of the Principles and Practice of Obstetric Medicine and Surgery, with descriptive Letterpress Prov Med Surg J October 03, 1840, s1-1 (1) 4; DOI: https://doi.org/10.1136/bmj.s1-1.1.4 A Practical Treatise on the Diseases peculiar to Women, illustrated by Cases, &c Prov Med Surg J October 03, 1840, s1-1 (1) 4-5; DOI: https://doi.org/10.1136/bmj.s1-1.1.4-a