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An ideal method of controlling conception, it has been said, must be harmless and convenient and must not offend taste or esthetic sensibilities; it should not affect sensation, it should be easily applied and it should be cheap and safe. The Ogino-Knaus method, it is claimed, fulfils all these requirements, with the possible exception of a certain amount of inconvenience. Periods of abstinence are required, but this is probably not a serious difficulty. Furthermore, the method has the approval of the church and the synagogue. Whether it is really safe is still a matter of discussion. The authors claim it to be so in 90 per cent of cases, as large a percentage of effectiveness as has been demonstrated for any of the mechanical and chemical devices available. The failures are attributed to very irregular menstruation, poor general health, disobedience and inadequate attention on the part of the women to
Periodic Fertility and Sterility in Woman.. Arch Intern Med (Chic). 1935;55(3):529. doi:10.1001/archinte.1935.00160210182013
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