Themes and Categories
Themes	Categories
A Lack of Perceived risk	・ Considering self as healthy and not getting the illness
A Lack of Perceived risk	・ Considering self as a low-risk group
Knowledge deficit	・ Inadequate knowledge about the benefits of the HPV vaccination to males
Inadequate promotion	・ Inadequate HPV vaccine promotion targeting to male
Inadequate promotion	・ Inadequate HPV vaccine promotion targeting to the whole population in Hong Kong
A high price of HPV vaccine	・ Unwillingness to pay for HPV vaccine
Inconvenience to receive HPV vaccine	・ Hard to find
Inconvenience to receive HPV vaccine	・ Time-consuming
Peer influence	・ Not mentioned from the peer