Table 2.

Characteristics of included studies

Characteristic	Clinical trials (n = 20)	Observational studies (n = 30)
Geographic location, n (%)
Asiaa	11 (55%)	11 (37%)b
Europe	6 (30%)	13 (44%)
North America	2 (1%)	3 (10%)
South America	0 (0%)	1 (3%)
Africa	0 (0%)	1 (3%)
Multiple countries	1 (5%)	0 (0%)
Not reported	0 (0%)	1 (3%)
Study setting, n (%)
Inpatient	1 (5%)	6 (20%)
Outpatient	7 (35%)	13 (44%)
Inpatient and outpatient	4 (20%)	1 (3%)
Not reported	8 (40%)	10 (33%)
Enrolment period, n (%)
After 2000	9 (45%)	12 (40%)
Before 2000	1 (5%)	5 (17%)
Not reported	10 (50%)	13 (43%)

^aIncluding Turkey as an Asian country (Turkey is situated in both Asia and Europe, with its larger territory lying on the Asian continent)

^bIncluding Russia