175 30. Mesen TB, Mersereau JE, Kane JB, Steiner AZ. Optimal timing for elective egg freezing. Fertil Steril 2015; 103(6): 1551-6 e1-4. 176 1. Brown KF, Rumgay H, Dunlop C, et al. The fraction of cancer attributable to modifiable risk factors in England, Wales, Scotland, Northern Ireland, and the United Kingdom in 2015. Br J Cancer 2018; 118(8): 1130–41. 177 1. Brown KF, Rumgay H, Dunlop C, et al. The fraction of cancer attributable to modifiable risk factors in England, Wales, Scotland, Northern Ireland, and the United Kingdom in 2015. Br J Cancer 2018; 118(8): 1130–41. 178 2. Joseph DN, Whirledge S. Stress and the HPA Axis: Balancing Homeostasis and Fertility. Int J Mol Sci 2017; 18(10). 179 3. Vanman EJ, Baker R, Tobin SJ. The burden of online friends: the effects of giving up Facebook on stress and well-being. J Soc Psychol 2018; 158(4): 496–507. 180 4. Fenster L, Waller K, Chen J, et al. Psychological stress in the workplace and menstrual function. Am J Epidemiol 1999; 149(2): 127–34. 181 5. Torner L. Actions of Prolactin in the Brain: From Physiological Adaptations to Stress and Neurogenesis to Psychopathology. Front Endocrinol (Lausanne) 2016; 7: 25. 182 6. Wang L, Wang X, Wang W, et al. Stress and dysmenorrhoea: a population based prospective study. Occup Environ Med 2004; 61(12): 1021–6. 183 7. Chen YT, Tenforde AS, Fredericson M. Update on stress fractures in female athletes: epidemiology, treatment, and prevention. Curr Rev Musculoskelet Med 2013; 6(2): 173–81. 184 8. Jimena P, Castilla JA, Peran F, et al. Adrenal hormones in human follicular fluid. Acta Endocrinol (Copenh) 1992; 127(5): 403–6. 185 9. Nargund VH. Effects of psychological stress on male fertility. Nat Rev Urol 2015; 12(7): 373–82. 186 10. Frederiksen Y, Farver-Vestergaard I, Skovgard NG, Ingerslev HJ, Zachariae R. Efficacy of psychosocial interventions for psychological and pregnancy outcomes in infertile women and men: a systematic review and meta-analysis. BMJ Open 2015; 5(1): e006592. 187