Persistent Health Issues, Adverse Events, and Effectiveness of Vaccines during the Second Wave of COVID-19: A Cohort Study from a Tertiary Hospital in North India oleh Upinder Kaur, Sapna Bala, Aditi Joshi, Noti Taruni Srija Reddy, Chetan Japur, Mayank Chauhan, Nikitha Pedapanga, Shubham Kumar, Anurup Mukherjee, Vaibhav Mishra, Dolly Talda, Rohit Singh, Rohit Kumar Gupta, Ashish Kumar Yadav, Poonam Jyoti Rana, Jyoti Srivastava, Shobha Bhat K., Anup Singh, Naveen Kumar P.G., Manoj Pandey, Kishor Patwardhan, Sangeeta Kansal, Sankha Shubhra Chakrabarti