Several studies reported that breast cancer risk showed a trend towards increased significance in the duration of hormonal contraceptive use of more than four years and even the first five years or more of use [ 1 , 11 , 15 , 27 , 28 ].
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Several studies reported that breast cancer risk showed a trend towards increased significance in the duration of hormonal contraceptive use of more than four years and even the first five years or more of use [ 1 , 11 , 15 , 27 , 28 ].