Table 1.

Included studies basic characteristics.

Study year	Country	Ethnicity	Cases	Gender (M/F)
Lee et al. 2020	Korea	East Asia	46	22/24
Pei et al. 2001	China	East Asia	86	43/43
Tang et al. 2009	China	East Asia	164	84/80
Xu and Peng 2018	China	East Asia	60	30/30
Zhang et al. 2013	China	East Asia	98	49/49
Zhu et al. 2017	China	East Asia	60	30/30
Wang et al. 2014	China	East Asia	340	170/170