Study Exclusion reasons Remarks Reference(s)
Teleman, 2004 case control Case-control study

Teleman Epidemiol. Infect. 2004; 132:797-803 10.1017/s0950268804002766

 
Wu, 2004 case control Case-control study

Wu Emerging Infect. Dis. 2004; 10:210-6 10.3201/eid1002.030730

 
Loeb, 2004 case control Case-control study

Loeb Emerging Infect. Dis. 2004; 10:251-5 10.3201/eid1002.030838

 
Wilder-Smith, 2005 case control Case-control study

Wilder-Smith Emerging Infect. Dis. 2005; 11:1142-5 10.3201/eid1107.041165

 
Wang, 2020 case control Case-control study

Wang JAMA 2020; : 10.1001/jama.2020.1585

 
Cheng, 2010 case control Case-control study

Cheng J. Hosp. Infect. 2010; 74:271-7 10.1016/j.jhin.2009.09.009

 
Jaeger, 2011 cohort Cohort study

Jaeger Infect Control Hosp Epidemiol 2011; 32:1149-57 10.1086/662709

 
Chokephaibulkit, 2012 case control Case-control study

Chokephaibulkit Influenza Other Respir Viruses 2013; 7:359-63 10.1111/irv.12016

 
Zhang, 2012 case control Case-control study

Zhang Emerging Infect. Dis. 2013; 19: 10.3201/eid1909.121765

 
Sung, 2016 retrospective cohort Retrospective study

Sung Clin. Infect. Dis. 2016; 63:999-1006 10.1093/cid/ciw451

 
Zhang, 2017 case control Case-control study

Zhang Nursing Practice and Research. 2017;14:118-119. 10.3969/j.issn.1672-9676.2017.22.046

 
Ma, 2004 case control Case-control study

Ma Zhonghua Liu Xing Bing Xue Za Zhi 2004; 25:741-4

 
Yin, 2004 case control Case-control study

Yin Zhonghua Liu Xing Bing Xue Za Zhi 2004; 25:18-22

 
Zhang, 2013 retrospective cohort Retrospective study

Zhang Influenza Other Respir Viruses 2013; 7:466-71 10.1111/irv.12025

 
Nishiura, 2005 case control Case-control study

Nishiura Am. J. Trop. Med. Hyg. 2005; 73:17-25

 
Li [retracted], 2020 - cancelled by investigator

Li W, Xiong J, Guo Y, Lip GYH. Preprints 2020 [retracted]