AIIMS Delhi Director, Dr Randeep Guleria expressed happiness after vaccines of Serum Institute of India and Bharat Biotech were granted permission for restricted use in emergency situation. "It's a great day for our country and it's a very good way to start the New Year. Both the vaccines are made in India. They are cost-effective and easy to administer. We should, in a very short period, start rolling out vaccine," said Dr Randeep Guleria.