4[4]Hofmeyr GJ, Nikodem CV, Woman WL, et al. Companlonship to modify the clinical birth environment, effects on progess and perceptions of labour, and breastfeeding. Br J Obstet Gyneacol,1991,98:756.
5[6]Lederman RP, Lederman E, Work BA, et al. The relationship of maternal anxiety, plasma catecholamines and plasma cortisol to progress in labor. Am J Obstet Gynecol,1978,132:495.
6[7]Adamsons K, Mueller-Heubach E, Myers RE. Production of fetal asphyxia in the rhesus monkey by administration of catecholamines to mether. Am J Obstet Gynecol,1971,109:248.
