Table 1.

The studies selected for review and their basic characteristics

Study	Country of origin	Number of cases	Type of study
Azavedo et al. [2]	Brazil	27	Cross sectional
Costa et al. [7]	Brazil	10	Case series
Maia et al. [12]	Brazil	2	Case series
Mayor et al. [11]	Paraguay	8	Cross sectional
Nasim et al. [6]	Pakistan	102	Cross sectional
Park et al. [3]	South Korea	1	Case report
Prasad et al. [4]	India	8	Case series
Raynaud et al. [13]	Singapore	6	Case series
Tan et al. [5]	Singapore	1	Case report
Tangnararatchak [14]	Thailand	1	Case report
Weerakkody	Sri Lanka	2	Unpublished data