Reference:
1. Levin ER, Hammes SR. Estrogens and progestins. In: Brunton LL, Chabner BA, Knollmann BC, editors. Goodman & Gilman’s the Pharmacological Basis of Therapeutics, 12th ed. New York: McGraw-Hill; 2011. p. 1163-9.
2. Wright KP, Johnson JV. Evaluation of extended and continuous use oral contraceptives. Ther Clin Risk Manag 2008;4:905-11.
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