"Ayurveda, Siddha, Unani systems of India appear to be the most formal and organized among traditional medical systems...Unani and Siddha are bracketed with Ayurveda by the Government of India and the general public when referring to Indian or indigenous medical systems...Most scholars put the origin of Ayurveda much before that of Siddha or Unani...the three systems are fundamentally similar in their approach to health and disease."