Every year, many women travel from the Chinese mainland to Hong Kong to get vaccinated against human papillomavirus, or HPV, a major cause of cervical cancer.

Jessica Cai, of Taizhou in Jiangsu province, has traveled to the city three times in the past six months to get inoculated, as the vaccine is not available on the mainland.

"The medical service in Hong Kong is safe and well-developed," said the 27-year-old, adding that her confidence in the city's hospitals is another reason she goes there for treatment.