Clinical profile of coronavirus disease 2019 comparing the first and second waves: A single-center study from North India. - Chhabra, Sandeep; Sethi, Suman; Kaur, Simran; Singla, Monika; Jindal, Jyoti; Midha, Vandana; Mahajan, Rajeshz; Bansal, Namita; Mohan, Bishav (International Journal of Applied & Basic Medical Research, 2022)