Study		Exclusion reasons	Remarks	Reference(s)
Yin Wang et al., 2020	retrospective cohort (registry)	not relevant study design		Yin Wang et al. medRxiv 10.1101/2020.03.06.20032342
Bernaola, 2020	retrospective cohort	other		Nikolas Bernaola medrxiv;2020.07.17.20155960v1 10.1101/2020.07.17.20155960