"0"^^ . . . . "rhythm method of birth control"^^ . . "rhythm method"@en-us . "100802146"@en-us . . . "100853145"^^ . . . . . . "00853145-n"^^ . "calendar method"@en-us . . . "rhythm method of birth control"@en-us . . . . "0"^^ . . "calendar method of birth control"@en-us . . . "rhythm"@en-us . . . . . . "natural family planning in which ovulation is assumed to occur 14 days before the onset of a period (the fertile period would be assumed to extend from day 10 through day 18 of her cycle)"@en-us .