Labor experience and beta-endorphin levels.
Hofmeyr
G J
GJ
Gülmezoglu
A M
AM
Nikodem
V C
VC
Van der Spuy
Z M
ZM
Hendricks
M S
MS
D005260:Female; D006801:Humans; D007743:Labor, Obstetric / Q000097:blood* / Q000523:psychology; D011247:Pregnancy; D001615:beta-Endorphin / Q000097:blood*
D001615:beta-Endorphin