#natural-contraception
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The Ogino-Knaus (O.K) Method of family planning and birth control, often referred to as the ‘Rhythm’ method.
The Ogino-Knaus (O.K) Method of family planning and birth control, often referred to as the ‘Rhythm’ method. Kyusaku Ogino, of Japan, and Hermann Knaus, of Austria, independently arrived at the same
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