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761Bulletin of the World Health Organization | September 2006, 84 (9) Public Health Classics Extracted from: Public Health Reports 1956; 71:652–8 Public Health Classics 762 Bulletin of the World Health Organization | September 2006, 84 (9) Extracted from: Public Health Reports 1956; 71:652–8 763Bulletin of the World Health Organization | September 2006, 84 (9) Public Health Classics Extracted from: Public Health Reports 1956; 71:652–8 [Tables 1,2,3 and 5 are included in the web version of this reproduction only. Available from : http//www.who.int/bulletin] Public Health Classics 764 Bulletin of the World Health Organization | September 2006, 84 (9) Extracted from: Public Health Reports 1956; 71:652–8