Department;
of;
Radiology,;
First;
Affiliated;
Hospital;
of;
Zhengzhou;
University,;
Zhengzhou,;
Henan;
450052,;
China;
Therapeutic;
Centre;
for;
AIDS;
and;
Sexually;
Transmitted;
Diseases,;
Affiliated;
You'an;
Hospital,;
Capital;
Medical;
University,;
Beijing;
100054,;
China;
Center;
for;
Diagnostic;
Medical;
Imaging,;
Nanfang;
Hospital,;
Southern;
Medical;
University,;
Guangzhou,;
Guangdong;
510515,;
China;