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2. 2. D. Lewellyn Jones (1978 ). Everywoman-a gynaecological guide for life . p.183 . Faber and Faber.
3. 3. C. Bourne (1977 ). Pregnancy , p.242 . Pan Books, London.
4. 4. J. W. Sedgewick (1725 ). A new treatise on liquers wherein the use and abuse of wine, malt drinks, water etc. are particularly consider'd in many diseases, constitutions and ages, with the proper manner of using them, hot or cold, either a physic diet or bath! Charles Rivington, London in Warner and Rosett op cit.
5. 5. C. A. Morris, and A. Millar (1759 ). A collection of the yearly bills of mortality from 1657 to 1758 inclusive. , London quoted in Warner and Rosett op cit.