1.1. Tyson JE, Friesen HG. Factors influencing the secretion of human prolactin and growth hormone in menstrual and gestational women. Am J Obstet Gynecol 1973; 116 (3): 377-87.2.2. Barberia JM, Abu-Fadil S, Kletzky OA, Nakamura RM, Mishell DR. Serum prolactin patterns in early human gestation. Am J Obstet Gynecol 1975; 121 (8): 1107-10.3.3. Ehara Y, Siler TM, Yen SS. Effects of large doses of estrogen on prolactin and growth hormone release. Am J Obstet Gynecol 1976; 125 (4): 455-8.4.4. Haslam SZ, Shyamala G. Progesterone receptors in normal mammary gland: receptor modulations in relation to differentiation. J Cell Biol 1980; 86 (3): 730-7.5.5. Murphy LJ, Murphy LC, Stead B et al. Modulation of lactogenic receptors by progestins in cultured human breast cancer cells. J Clin Endocrinol Metab 1986; 62 (2): 280-7.6.6. Simon WE, Pahnke VG, Hölzel F. In vitro modulation of prolactin binding to human mammary carcinoma cells by steroid hormones and prolactin. J Clin Endocrinol Metab 1985; 60 (6): 1243-9.7.7. Lee CS, Oka T. Progesterone regulation of a pregnancy-specific transcription repressor to beta-casein gene promoter in mouse mammary gland. Endocrinology 1992; 131 (5): 2257-62.8.8. Battin DA, Marrs RP, Fleiss PM, Mishell DR Jr. Effect of suckling on serum prolactin, luteinizing hormone, follicle-stimulating hormone, and estradiol during prolonged lactation. Obstet Gynecol 1985; 65 (6): 785-8.9.9. Stern JM, Konner M, Herman TN, Reichlin S. Nursing behaviour, prolactin and postpartum amenorrhoea during prolonged lactation in American and Kung mothers. Clin Endocrinol (Oxf.) 1986; 25 (3): 247-58.10.10. Tay CC, Glasier AF, McNeilly AS. Twenty-four hour patterns of prolactin secretion during lactation and the relationship to suckling and the resumption of fertility in breast-feeding women. Hum Reprod 1996; 11 (5): 950-5.11.11. Dawood MY, Khan-Dawood FS, Wahi RS, Fuchs F. Oxytocin release and plasma anterior pituitary and gonadal hormones in women during lactation. J Clin Endocrinol Metab 1981; 52 (4) :678-83.12.12. McNeilly AS, Robinson IC, Houston MJ, Howie PW. Release of oxytocin and prolactin in response to suckling. Br Med J (Clin Res Ed) 1983; 286 (6361): 257-9.13.13. Nishimori K, Young LJ, Guo Q et al. Oxytocin is required for nursing but is not essential for parturition or reproductive behavior. Proc Natl Acad Sci USA 1996; 93 (21): 11699-704.14.14. McClellan HL, Miller SJ, Hartmann PE. Evolution of lactation: nutrition v. protection with special reference to five mammalian species. Nutr Res Rev 2008; 21 (2): 97-116.15.15. Betzold CM, Galactagogues J. Midwifery Womens Health 2004; 49 (2): 151-4.16.16. Kremer JA, Rolland R, van der Heijden PF et al. Return of gonadotropic function in postpartum women during bromocriptine treatment. Fertil Steril 1989; 51 (4): 622-7.17.17. Haartsen JE, Heineman MJ, Elings M et al. Resumption of pituitary and ovarian activity post-partum: endocrine and ultrasonic observations in bromocriptine-treated women. Hum Reprod 1992; 7 (6): 746-50.18.18. Kumar R, Cohen WR, Epstein FH.Vitamin D and calcium hormones in pregnancy. N Engl J Med 1980; 302 (20): 1143-5.19.19. Kovacs CS, Kronenberg HM. Maternal-fetal calcium and bone metabolism during pregnancy, puerperium, and lactation. Endocr Rev 1997; 18 (6): 832-72.20.20. Sowers M, Corton G, Shapiro B et al. Changes in bone density with lactation. JAMA 1993; 269 (24): 3130-5.21.21. Kalkwarf HJ, Specker BL. Bone mineral loss during lactation and recovery after weaning. Obstet Gynecol 1995; 86 (1): 26-32.22.22. Kovacs CS. Calcium and bone metabolism in pregnancy and lactation. J Clin Endocrinol Metab 2001; 86 (6): 2344-8.23.23. Kalkwarf HJ, Specker BL, Bianchi DC et al. The effect of calcium supplementation on bone density during lactation and after weaning. N Engl J Med 1997; 337 (8): 523-8.24.24. Kovacs CS. Vitamin D in pregnancy and lactation: maternal, fetal, and neonatal outcomes from human and animal studies. Am J Clin Nutr 2008; 88 (2): 520S-528S.25.25. Ofluoglu O, Ofluoglu D. A case report: pregnancy-induced severe osteoporosis with eight vertebral fractures. Rheumatol Int 2008; 29 (2): 197-201. Epub 2008 Jul 17.26.26. Stumpf UC, Kurth AA, Windolf J, Fassbender WJ. Pregnancy-associated osteoporosis: an underestimated and underdiagnosed severe disease. A review of two cases in short- and long-term follow-up. Adv Med Sci 2007; 52: 94-7.27.27. Hellmeyer L, Kühnert M, Ziller V et al. The use of i.v. bisphosphonate in pregnancy-associated osteoporosis-case study. Exp Clin Endocrinol Diabetes 2007; 115 (2): 139-42.28.28. Pettitt DJ, Forman MR, Hanson RL et al. Breastfeeding and incidence of non-insulin-dependent diabetes mellitus in Pima Indians. Lancet 1997; 350 (9072): 166-8.29.29. Díaz S, Aravena R, Cárdenas H et al. Contraceptive efficacy of lactational amenorrhea in urban Chilean women. Contraception 1991; 43 (4): 335-52.30.30. Wasalathanthri S, Tennekoon KH. Lactational amenorrhea/anovulation and some of their determinants: a comparison of well-nourished and undernourished women. Fertil Steril 2001; 76 (2): 317-25.31.31. Speroff L, Fritz MA, 2005.32.32. Campbell OM, Gray RH. Characteristics and determinants of postpartum ovarian function in women in the United States. Am J Obstet Gynecol 1993; 169 (1): 55-60.33.33. Visness CM, Kennedy KI, Gross BA et al. Fertility of fully breast-feeding women in the early postpartum period. Obstet Gynecol 1997; 89 (2): 164-7.34.34. Korver T et al. 1998, 2005.35.35. Bjarnadottir RI et al. 2001.36.36. King J. 2007.37.37. Reinprayoon D et al. 2000.