1. Pain thresholds are elevated during pseudopregnancy;Gintzler,1990
2. Opioid-mediated changes in nociceptive threshold during pregnancy and parturition in the sow;Jarvis,1997
3. Endorphin-mediated increases in pain threshold during pregnancy;Gintzler,1980
4. Experimental heat pain for detecting pregnancy-induced analgesia in humans;Carvalho,2006
5. Pregnancy-induced analgesia: a combined psychophysical and neurophysiological study;Draisci,2012