Nelson Textbook of Pediatrics 22nd Edition | Contraceptive efficacy tiers (LARC Tier 1, COCs/patch/ring Tier 2, condoms/withdrawal Tier 3), long-acting reversible contraception (IUDs, implant), combined hormonal contraceptives (pills, patch, ring), progestin-only methods, emergency contraception (LNG, ulipristal acetate, copper IUD).
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