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Lee NM, Saha S. Nausea and vomiting of pregnancy. <i>Gastroenterol Clin North Am<\/i>. 2011;40(2):309\u2013334, vii.","DOI":"10.1016\/j.gtc.2011.03.009"},{"key":"2","unstructured":"2. Bustos M, Venkataramanan R, Caritis S. Nausea and vomiting of pregnancy\u2014What\u2019s new? <i>Auton Neurosci<\/i>. 2017;202:62\u201372."},{"key":"3","doi-asserted-by":"crossref","unstructured":"3. Veenendaal MV, van Abeelen AF, Painter RC, van der Post JA, Roseboom TJ. Consequences of hyperemesis gravidarum for offspring: a systematic review and meta-analysis. <i>BJOG<\/i>. 2011;118(11):1302\u20131313.","DOI":"10.1111\/j.1471-0528.2011.03023.x"},{"key":"4","doi-asserted-by":"crossref","unstructured":"4. Colodro-Conde L, Jern P, Johansson A, et\u00a0al. Nausea and vomiting during pregnancy is highly heritable. <i>Behav Genet<\/i>. 2016;46(4):481\u2013491.","DOI":"10.1007\/s10519-016-9781-7"},{"key":"5","doi-asserted-by":"crossref","unstructured":"5. Fejzo MS, Ingles SA, Wilson M, et\u00a0al. High prevalence of severe nausea and vomiting of pregnancy and hyperemesis gravidarum among relatives of affected individuals. <i>Eur J Obstet Gynecol Reprod Biol<\/i>. 2008;141(1):13\u201317.","DOI":"10.1016\/j.ejogrb.2008.07.003"},{"key":"6","doi-asserted-by":"crossref","unstructured":"6. Louik C, Hernandez-Diaz S, Werler MM, Mitchell AA. Nausea and vomiting in pregnancy: maternal characteristics and risk factors. <i>Paediatr Perinat Epidemiol<\/i>. 2006;20(4):270\u2013278.","DOI":"10.1111\/j.1365-3016.2006.00723.x"},{"key":"7","unstructured":"7. Klebanoff MA, Koslowe PA, Kaslow R, Rhoads GG. Epidemiology of vomiting in early pregnancy. <i>Obstet Gynecol<\/i>. 1985;66(5):612\u2013616."},{"key":"8","doi-asserted-by":"crossref","unstructured":"8. Gadsby R, Barnie-Adshead AM, Jagger C. Pregnancy nausea related to women\u2019s obstetric and personal histories. <i>Gynecol Obstet Invest<\/i>. 1997;43(2):108\u2013111.","DOI":"10.1159\/000291833"},{"key":"9","doi-asserted-by":"crossref","unstructured":"9. Askling J, Erlandsson G, Kaijser M, Akre O, Ekbom A. Sickness in pregnancy and sex of child. <i>Lancet<\/i>. 1999;354(9195):2053.","DOI":"10.1016\/S0140-6736(99)04239-7"},{"key":"10","doi-asserted-by":"crossref","unstructured":"10. Basso O, Olsen J. Sex ratio and twinning in women with hyperemesis or pre-eclampsia. <i>Epidemiology<\/i>. 2001;12(6):747\u2013749.","DOI":"10.1097\/00001648-200111000-00026"},{"key":"11","doi-asserted-by":"crossref","unstructured":"11. del Mar Melero-Montes M, Jick H. Hyperemesis gravidarum and the sex of the offspring. <i>Epidemiology<\/i>. 2000;12(1):123\u2013124.","DOI":"10.1097\/00001648-200101000-00020"},{"key":"12","doi-asserted-by":"crossref","unstructured":"12. Schiff MA, Reed SD, Daling JR. The sex ratio of pregnancies complicated by hospitalisation for hyperemesis gravidarum. <i>BJOG<\/i>. 2004;111(1):27\u201330.","DOI":"10.1046\/j.1471-0528.2003.00005.x"},{"key":"13","doi-asserted-by":"crossref","unstructured":"13. Chortatos A, Haugen M, Iversen PO, et\u00a0al. Pregnancy complications and birth outcomes among women experiencing nausea only or nausea and vomiting during pregnancy in the Norwegian Mother and Child Cohort Study. <i>BMC Pregnancy Childbirth<\/i>. 2015;15:138.","DOI":"10.1186\/s12884-015-0580-6"},{"key":"14","doi-asserted-by":"crossref","unstructured":"14. Zhou Q, O\u2019Brien B, Relyea J. Severity of nausea and vomiting during pregnancy: what does it predict? <i>Birth<\/i>. 1999;26(2):108\u2013114.","DOI":"10.1046\/j.1523-536x.1999.00108.x"},{"key":"15","doi-asserted-by":"crossref","unstructured":"15. Michikawa T, Nitta H, Nakayama SF, et\u00a0al; Japan Environment and Children\u2019s Study Group. Baseline Profile of Participants in the Japan Environment and Children\u2019s Study (JECS). <i>J Epidemiol<\/i>. 2018;28(2):99\u2013104.","DOI":"10.2188\/jea.JE20170018"},{"key":"16","doi-asserted-by":"crossref","unstructured":"16. Kawamoto T, Nitta H, Murata K, et\u00a0al; Working Group of the Epidemiological Research for Children\u2019s Environmental Health. Rationale and study design of the Japan environment and children\u2019s study (JECS). <i>BMC Public Health<\/i>. 2014;14:25.","DOI":"10.1186\/1471-2458-14-25"},{"key":"17","doi-asserted-by":"crossref","unstructured":"17. Tan PC, Jacob R, Quek KF, Omar SZ. The fetal sex ratio and metabolic, biochemical, haematological and clinical indicators of severity of hyperemesis gravidarum. <i>BJOG<\/i>. 2006;113(6):733\u2013737.","DOI":"10.1111\/j.1471-0528.2006.00947.x"},{"key":"18","doi-asserted-by":"crossref","unstructured":"18. Bashiri A, Neumann L, Maymon E, Katz M. Hyperemesis gravidarum: epidemiologic features, complications and outcome. <i>Eur J Obstet Gynecol Reprod Biol<\/i>. 1995;63(2):135\u2013138.","DOI":"10.1016\/0301-2115(95)02238-4"},{"key":"19","doi-asserted-by":"crossref","unstructured":"19. Dodds L, Fell DB, Joseph KS, Allen VM, Butler B. Outcomes of pregnancies complicated by hyperemesis gravidarum. <i>Obstet Gynecol<\/i>. 2006;107(2 Pt 1):285\u2013292.","DOI":"10.1097\/01.AOG.0000195060.22832.cd"},{"key":"20","doi-asserted-by":"crossref","unstructured":"20. Naumann CR, Zelig C, Napolitano PG, Ko CW. Nausea, vomiting, and heartburn in pregnancy: a prospective look at risk, treatment, and outcome. <i>J Matern Fetal Neonatal Med<\/i>. 2012;25(8):1488\u20131493.","DOI":"10.3109\/14767058.2011.644363"},{"key":"21","doi-asserted-by":"crossref","unstructured":"21. Petitti DB. Nausea and pregnancy outcome. <i>Birth<\/i>. 1986;13(4):223\u2013226.","DOI":"10.1111\/j.1523-536X.1986.tb01052.x"},{"key":"22","doi-asserted-by":"crossref","unstructured":"22. Masson GM, Anthony F, Chau E. Serum chorionic gonadotrophin (hCG), schwangerschaftsprotein 1 (SP1), progesterone and oestradiol levels in patients with nausea and vomiting in early pregnancy. <i>Br J Obstet Gynaecol<\/i>. 1985;92(3):211\u2013215.","DOI":"10.1111\/j.1471-0528.1985.tb01084.x"},{"key":"23","unstructured":"23. Goodwin TM, Montoro M, Mestman JH, Pekary AE, Hershman JM. The role of chorionic gonadotropin in transient hyperthyroidism of hyperemesis gravidarum. <i>J Clin Endocrinol Metab<\/i>. 1992;75(5):1333\u20131337."},{"key":"24","unstructured":"24. Soules MR, Hughes CL Jr, Garcia JA, Livengood CH, Prystowsky MR, Alexander E 3rd. 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Human chorionic gonadotropin in cord blood and peripheral maternal blood in singleton and twin pregnancies at delivery. <i>Acta Obstet Gynecol Scand<\/i>. 1989;68(8):689\u2013692.","DOI":"10.3109\/00016348909006140"},{"key":"28","doi-asserted-by":"crossref","unstructured":"28. Niebyl JR. Clinical practice. Nausea and vomiting in pregnancy. <i>N Engl J Med<\/i>. 2010;363(16):1544\u20131550.","DOI":"10.1056\/NEJMcp1003896"},{"key":"29","doi-asserted-by":"crossref","unstructured":"29. Vandraas KF, Vikanes \u00c5V, St\u00f8er NC, Vangen S, Magnus P, Grjibovski AM. Is hyperemesis gravidarum associated with placental weight and the placental weight-to-birth weight ratio? 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