Bartels A, Zeki S. The neural correlates of maternal and romantic love. Neuroimage 2004;21:1155-66. Beilin Y, Bodian CA, Weiser J, et al. Effect of labor epidural analgesia with and without fentanyl on in – fant breast-feeding: a prospective, randomized, double-blind study. Anesthesiology 2005;103: 1211-7. Christensson K, Cabrera T, Christensson E, et al. Separation distress call in the human neonate in the absence of maternal body contact. Acta Paediatr 1995;84:468-73. Griggle KD. A model for caregiving of adopted children after institutionalization. J Child Adolesc Psychiatr Nurs 2007;20:14-26. Groër MW. Differences Between Exclusive Breastfeeders, Formula-Feeders, and Controls: A Study of Stress, Mood, and Endocrine Variables. Biological Research For Nursing 2005;7:106-17. Horsley T, Clifford T, Barrowman N, et al. Benefits and Harms Associated With the Practice of Bed Sharing. A Systematic Review. Arch Pediatr A do – lesc Med 2007;161:237-45. Insel TA. Neurobiological basis of social attachment. Am J Psychiatry 1997;154:726-35. Leckman JF, Goodman WK, North WG, et al. The role of central oxytocin in obsessive compulsive disorder and related normal behavior. Psycho neu – roendocrinology 1994;19:723-49. St. James-Roberts I, Alvarez M, Csipke E, et al. Infant Crying and Sleeping in London, Copenha – gen and When Parents Adopt a Proximal Form of Care. Pediatrics 2006;117;1146-55. Uvnas-Moberg K. Oxytocin may mediate the benefits of positive social interaction and emotions. Psychoneuroendocrinology 1998;23:819-35.