Duties and responsibilities in the Swiss health care system are divided among the federal, cantonal, and municipal levels of government. The system can be considered highly decentralized, as the cantons play a critical role. Each of the 26 cantons (including six half-cantons) has its own constitution and is responsible for licensing providers, coordinating hospital services, and subsidizing institutions and individual premiums. The federal government plays an important role in regulating the financing of the system, which is effected through mandatory health insurance (MHI) and other social insurance; ensuring the quality and safety of pharmaceuticals and medical devices; overseeing public health initiatives; and promoting research and training. The municipalities, in turn, are responsible mainly for long-term care (nursing homes and home care services) and other social support services for vulnerable groups.