Table 2. Article extraction.

First author	Year published	Study design	Country	Economic status	No. of patients	Percentage of total patients (%)*
Alam [14]	2015	Retrospective	India	Developing	30	1.0
Alam [15]	2016	Prospective	India	Developing	33	1.1
Baris [16]	2012	Retrospective	Turkey	Developing	74	2.5
Bersani [17]	2019	Retrospective	Italy	Developed	10	0.3
Brett [18]	2013	Retrospective	Portugal	Developed	28	0.9
Chongsrisawat [19]	2009	Retrospective	Thailand	Developing	53	1.8
Di Giorgio [20]	2019	Retrospective	Italy	Developed	56	1.9
Di Giorgio [21]	2017	Retrospective	Italy	Developed	55	1.8
Gilbert Perez [22]	2018	Retrospective	Spain	Developed	49	1.6
Grama [23]	2019	Retrospective	Romania	Developing	97	3.2
Hegarty [24]	2013	Retrospective	UK	Developed	127	4.2
Kathemann [25]	2015	Retrospective	Germany	Developed	37	1.2
Kaur [26]	2013	Prospective	India	Developing	43	1.4
Lee [27]	2018	Retrospective	Argentina	Developing	210	7.0
Lu [28]	2009	Prospective	USA	Developed	53	1.8
Mazumder [29]	2016	Retrospective	Bangladesh	Developing	62	0.2
Mckiernan [30]	2016	Retrospective	UK	Developed	39	1.3
Mustafa [31]	2009	Retrospective	UK	Developed	56	1.9
Narkewicz [32]	2018	Prospective	USA and UK	Developed	1,144	38.3
Ng [33]	2016	Retrospective and prospective	Malaysia	Developing	60	2.0
Nunez-Ramos [34]	2018	Retrospective	Spain	Developed	20	0.1
Oh [35]	2016	Retrospective	Korea	Developed	126	4.2
Ozcay [36]	2011	Retrospective	Turkey	Developing	67	2.2
Ozcay [37]	2016	Retrospective	Turkey	Developing	91	3.0
Rajanayagam [38]	2013	Retrospective	Australia	Developed	54	1.8
Rivera-Penera [39]	1997	Retrospective	USA	Developed	66	2.2
Sanchez [40]	2016	Retrospective	Argentina	Developing	57	1.9
Sanchez [41]	2012	Retrospective	Argentina	Developing	40	1.3
Silverio [42]	2015	Prospective	Cuba	Developing	31	1.0
Tung [43]	2000	Retrospective	London	Developed	75	2.5
Wands [44]	2018	Retrospective	Scotland	Developed	24	0.8
Yankol [45]	2016	Retrospective	Turkey	Developing	22	0.7

^*Rounded to nearest 0.1%.