Columbia subject headings:
Harvard subject headings:
Amenorrhea, Lactation--Congresses.
Breastfeeding--Congresses.
Contraception--Congresses
Lactation--Congresses.
Oral contraceptives--Side effects--Congresses.
Princeton subject headings:
Amenorrhea, Lactation--Congresses.
Breastfeeding--Congresses.
Contraception--Congresses.
Lactation--Congresses.
Oral contraceptives--Side effects--Congresses.