Systematic review ID
1 = Levira 2017
2 = Thurman 2017
3 = Escalaya 2015
4 = Nevalainen 2014
5 = Shackleton 2002
6 = Watila 2018

Study publication year group
1 = 1930s
2 = 1940s
3 = 1950s
4 = 1960s
5 = 1970s
6 = 1980s
7 = 1990s
8 = 2000s
9 = 2010s

Study continent
1 = Africa
2 = Antarctica
3 = Australasia
4 = Europe
5 = North America and Canada
6 = Central and South America
7 = Central & North Asia (Kazakh region & Siberia)
8 = East Asia (Far East)
9 = West Asia (Middle East)
10 = South Asia (Indian subcontinent)
11 = Southeast Asia

Hopsital- or community-based or both
1 = Hospital-based
2 = Community-based
3 = Both

Adult (18 and above), pediatric (less than 18), All ages
1 = Paediatric
2 = Adult
3 = All ages

Incident or prevalent or both cohorts
1 = Incident cases
2 = Prevalent cases
3 = Both incident &* prevalent cases