The National Institute of Siddha is one of the seven apex national-level educational institutions that promote excellence in Indian system of medicine and Ayurveda.[315] Major hospitals in Chennai include Apollo Hospitals, Apollo Speciality Hospital, SRM Medical College Hospital and Research Centre, Chettinad Health City, MIOT Hospitals, Sri Ramachandra Medical College and Research Institute, Fortis Malar Hospital, Lifeline Hospitals, Vasan Healthcare, Dr Mehta Hospitals, Global Hospitals & Health City, Sankara Nethralaya and Vijaya Medical & Educational Trust.[316] Chennai attracts about 45 percent of health tourists from abroad and 30 percent to 40 percent of domestic health tourists.