Table 1.

Characteristics of included studies (N = 31).

First author (year)	Study location	Sample size	Data source	Reporting period (2019 & 2020)	Outcomes examined	Risk of bias
Amram, 202118	USA	83,200	Multi-institutional	Apr-Dec	Screening	Low
Barriga, 202119	Chile	156	Single-institution	Apr-Jul	Diagnosis	Moderate
Bessa, 202120	Brazil	2,848,181	Registry	Jan-Dec	Screening	Moderate
Borsky, 202121	UK	238	Single-institution	Aug-Oct	Diagnosis	Moderate
Chang, 202122	USA	1069	Multi-institutional	Mar-May	Diagnosis	Moderate
Chou, 202125	Taiwan	243	Single-institution	Jan-Jul	Diagnosis	Low
de Degani, 202126	Argentina	12,016	Multi-institutional	Mar-Sep	Screening	Moderate
DeGroff, 202127	USA	75,610	Multi-institutional	Apr-Jun*	Screening	Moderate
Eijkelboom, 20219,28	Netherlands	9430	Registry	Week 9-35	Diagnosis	Low
Ferrara, 202129	Italy	1003	Multi-institutional	Week 11-20**	Diagnosis	Moderate
Hamilton, 202130	UK	1444	Multi-institutional	Mar-Sep	Diagnosis	Moderate
Kaltofen, 202131	Germany	320	Single-institution	Jan-Jun	Diagnosis	Moderate
Kang, 202132	South Korea	35,943	Multi-institutional	Feb-Jul	Both	Moderate
Kempf, 202133	France	1145	Single-institution	Mar-Sep	Diagnosis	Moderate
Knoll, 202134	Austria	475	Single-institution	Mar-Dec	Diagnosis	Low
Lloyd, 202135	USA	11,011	Single-institution	Jan-Dec***	Both	Moderate
Mantellini, 202010	Italy	1,283,703	Registry	Jan-May	Screening	Moderate
Miller, 202136	USA	29,180	Single-institution	Mar-Oct	Screening	Low
Morais, 202137	Portugal	597	Single-institution	Mar-Jul	Diagnosis	Moderate
O’Brien, 202138	UK	396	Single-institution	Feb-Jul	Diagnosis	Moderate
Sacoto, 202139	Spain	21,775	Single-institution	Jan-Dec	Both	Moderate
Skovlund, 202140	Denmark	823	Registry	Feb-May*	Diagnosis	Moderate
Sprague, 202141	USA	316,494	Multi-institutional	Jan-Jul	Screening	Moderate
Tonneson, 202142	USA	571	Single-institution	Mar-Aug	Diagnosis	Moderate
Toss, 202143	Italy	25,389	Single-institution	May-Jul	Both	Moderate
Tsai, 202044	Taiwan	704,834	Registry	Jan-Apr	Screening	Low
Tsibulak, 202045,46	Austria	552	Multi-institutional	Mar-May	Diagnosis	Moderate
van Wyk, 202147	South Africa	386	Single-institution	Apr-Jun	Diagnosis	Moderate
Vardhanabhuti, 202148	Hong Kong	8092	Registry	Jan-Dec	Diagnosis	Moderate
Velazquez, 202149	USA	9047	Single-institution	Jan-Dec	Screening	Low
Vrdoljak, 202150	Croatia	5723	Registry	Jan-Dec	Diagnosis	Moderate

*Pre-COVID period included 2015-2019 [average].

**Pre-COVID period included 2018-2019 [average].

***Pre-COVID period included 2016-2019 [average].