Independent means.
Crowe
M E
ME
Demilew
J
J
Leap
N
N
Norris
D
D
Reed
R
R
Watson
C
C
D005260:Female; D006801:Humans; D008131:London; D008427:Maternal Health Services / Q000458:organization & administration*; D008880:Midwifery; D011247:Pregnancy; D011295:Prenatal Care / Q000458:organization & administration