2.2. Selection criteria
We did not apply any regions, publication types, language restrictions.
Articles were included if they: i) reported the 30-day or in-hospital
mortality; ii) Case reports and case series had to include limited
people (≥4) in each study. According to the selection criteria, 27
articles meet the strict criteria. A PRISMA flow chart depicts the
process of search and selection of studies shown in Figure 1.