Clinical outcomes among COVID-19 patients managed with modern and traditional Siddha medicine – A retrospective cohort study oleh Ramaswamy Meenakumari, Karuppiah Thangaraj, Arunachalam Sundaram, Malayappan Meenakshi Sundaram, Ponnappan Shanmugapriya, Andi Mariappan, Melvin George, Venkatesan Suba, Elumalai Rajalakshmi, Muthappan Sendhilkumar