Collaborators: GRID COVID-19 Study Group Members: Coordinators: Mohan Bairwa (All India Institute of Medical Sciences, New Delhi, India); Sabyasachi Behera (GRID Council, Bhubaneswar, India); Paragkumar Dhirajlal Chavda (Gujarat Medical Education and Research Society Medical College, Vadodara, Gujarat, India); Praveen Kulkarni (JSS Academy of Higher Education & Research, Mysuru, Karnataka, India); Archisman Mohapatra (GRID Council, Delhi NCR, India); Balaji Ramraj (SRM Medical College Hospital and Research Centre, SRM Institute of Science and Technology, Chennai, Tamil Nadu, India); Siddharudha Shivalli (London School of Hygiene & Tropical Medicine, London, UK); Arvind Kumar Singh (All India Institute of Medical Sciences, Bhubaneswar, Odisha, India); Manish Kumar Singh (Dr Ram Manohar Lohia Institute of Medical Sciences, Lucknow, Uttar Pradesh, India). Members of the nationwide network: Northern India: Ravi Rohilla (Government Medical College & Hospital, Chandigarh); Bharti Chawla, Sumit Chawla (Pt JLN Government Medical College and Hospital, Chamba, Himachal Pradesh); Rabbanie Tariq Wani (Government Medical College, Srinagar, Jammu & Kashmir); Rashmi Agarwalla (Hamdard Institute of Medical Sciences and Research, New Delhi); Pranab Chatterjee (Independent Public Health Consultant, New Delhi); Shubhashri Sudhiendra Jahagirdar (The INCLEN Trust International, New Delhi); Madan Mohan Majhi (Maulana Azad Medical College, New Delhi); Harshal Ramesh Salve, Pallavi Shukla, Kapil Yadav, Ramadass Sathiyamoorthy, Nitika Sharma (All India Institute of Medical Sciences, New Delhi); Kaushik Sarkar (Aceso Global Health Consultants Limited - India, New Delhi); Soumya Swaroop Sahoo, Madhur Verma (All India Institute of Medical Sciences, Bathinda, Punjab); North-Central India: Shamshad Ahmad (All India Institute of Medical Sciences, Patna, Bihar); Dewesh Kumar (Rajendra Institute of Medical Sciences, Ranchi, Jharkhand); Anirban Chatterjee (All India Institute of Medical Sciences, Bhopal, Madhya Pradesh); Gaihemlung Pamei (Government Medical College, Haldwani, Uttarakhand); Hariom Kumar Solanki (Government Institute of Medical Sciences, Greater Noida, Uttar Pradesh); Eastern and North-Eastern India: Shashanka Shekhar Chakraborty (Gauhati Medical College, Guwahati, Assam); Gitismita Naik, M Mohan Kumar (All India Institute of Medical Sciences, Raipur, Chhattisgarh); Chinnadurai Aravinda (All India Institute of Medical Sciences, Bhubaneswar, Odisha); Shilpa Karir, Jasmin Nilima Panda (Veer Surendra Sai Institute of Medical Sciences and Research, Burla, Odisha); Jaya Singh Kshatri (Indian Council of Medical Research-Regional Medical Research Center, Bhubaneswar, Odisha); Smrutiranjan Nayak (Kalinga Institute of Medical Sciences, Bhubaneswar, Odisha); Sithun Kumar Patro (Maharaja Krushna Chandra Gajapati Medical College & Hospital, Brahmapur, Odisha); Shib Sekhar Datta (Tripura Medical College and Dr BR Ambedkar Memorial Teaching Hospital, Agartala, Tripura); Nilanjana Ghosh (North Bengal Medical College & Hospital, Darjeeling, West Bengal); Pritam Roy (Independent Public Health Researcher, Kolkata, West Bengal); Southern India: Shankar Reddy Dudala (Government Medical College, Kadapa, Andhra Pradesh); Rachana R Annadani, Malatesh Undi (Karwar Institute of Medical Sciences, Karwar, Karnataka); Sudhir Prabhu (Father Muller Medical College, Mangalore, Karnataka); Santosh K Yatnatti (Dr Chandramma Dayananda Sagar Institute of Medical Education and Research, Bengaluru, Karnataka); Rakesh N Pillai (GRID Council, Thiruvananthapuram, Kerala); Antony Stanley (Achutha Menon Centre for Health Science Studies, Thiruvananthapuram, Kerala); Satyanarayana G Konda (Mamata Academy of Medical Science, Hyderabad, Telangana); Western India: Kajal Davara (Gujarat Medical Education and Research Society Medical College, Vadodara, Gujarat); Mihir Prafulbhai Rupani (Government Medical College, Bhavnagar, Gujarat); Anuj Mundra (Mahatma Gandhi Institute of Medical Sciences, Sewagram, Maharashtra); Akhil Dhanesh Goel, Manoj Kumar Gupta (All India Institute of Medical Sciences, Jodhpur, Rajasthan).