Columbia subject headings:
MIRIAD.
Midwives--Databases.
Obstetrics--Research--Great Britain.
Harvard subject headings:
Midwifery research database (Computer file)
Midwifery--Databases.
Midwifery--Research--Great Britain.
Princeton subject headings:
Midwifery research database (Computer file)
Midwives--Databases.
Obstetrics--Research--Great Britain.