① 赵睿, 等. 人体免疫衰老与肿瘤及感染的关系研究进展[J]. 中华医学杂志. 2019;99(16):1278-1280.,② 中华预防医学会新型冠状病毒肺炎防控专家组. 新型冠状病毒肺炎流行病学特征的最新认识[J]. 中华流行病学杂志. 2020;41(2):139-144.,③ Prather AA, et al. Association of Insufficient Sleep With Respiratory Infection Among Adults in the United States[J]. JAMA Intern Med. 2016;176(6):850–852.,④ Lawrence H, et al. Cigarette smoking and the occurrence of influenza - Systematic review[J]. J Infect. 2019;79(5):401–406.,⑤ 国家卫生健康委员会《新型冠状病毒感染的肺炎诊疗方案(第七版)》,⑥ Turner RB, et al. Effect of probiotic on innate inflammatory response and viral shedding in experimental rhinovirus infection - a randomised controlled trial[J]. Benef Microbes. 2017;8(2):207–215.,⑦ Leyer GJ, et al. Probiotic effects on cold and influenza-like symptom incidence and duration in children[J]. Pediatrics. 2009;124(2):e172–e179.,⑧ Fuller R, et al. Influence of yeast-derived 1,3/1,6 glucopolysaccharide on circulating cytokines and chemokines with respect to upper respiratory tract infections[J]. Nutrition. 2012;28(6):665–669.,⑨ Talbott SM, et al. Baker's yeast beta-glucan supplement reduces upper respiratory symptoms and improves mood state in stressed women[J]. J Am Coll Nutr. 2012;31(4):295–300.,⑩ ZHAO YF, et al. Epidemiology of functional constipation and comparison with constipation-predominant irritable bowel syndrome: the Systematic Investigation of Gastrointestinal Diseases in China(SILC)[J].Aliment Pharmacol Tiler. 2013;4(8):1020.