Special administrative regions are empowered to contract a wide range of agreements with other countries and territories such as mutual abolition of visa requirement, mutual legal aid, air services, extradition, handling of double taxation and others, with no Chinese government involvement. However, in some diplomatic talks involving a SAR, the SAR concerned may choose to send officials to be part of the Chinese delegation. For example, when former Director of Health of Hong Kong Margaret Chan became the World Health Organization (WHO) Director-General, she served as a delegate from the People's Republic of China to the WHO.