Number

Author

Year

Method

Case group

(n/N)

Control group (n/N)

1

Feng Jingqiao

2016

Immunofluorescence

17/103

2/52

2

Fan Ruyan

2015

Immunofluorescence

154/367

39/403

3

Zheng Jieli

2016

Immunofluorescence

111/246

23/246

4

5

Zou Yingxue

Pan Junxiu

2003

2015

m-RT-PCR

Immunofluorescence

17/103

32/67

2/52

9/73