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Two investigators (NS and TS) independently screened both titles and abstracts to exclude non-relevant trials. Discrepancies were resolved by a third author (NA). Relevant full-text articles were retrieved and analyzed for eligibility using the pre-defined inclusion criteria.
Copyright and License information: Springer-Verlag GmbH Germany, part of Springer Nature ©2021
This article is made available via the PMC Open Access Subset for unrestricted research re-use and secondary analysis in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the World Health Organization (WHO) declaration of COVID-19 as a global pandemic.
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