Prevalence of Aspergillus colonization and sensitization in patients hospitalized with acute exacerbation of chronic obstructive pulmonary disease - Gurkamal Singh; Mohan K. Hanumanthappa; Ritesh Agarwal; Shivaprakash M. Rudramurthy; Nidhi Prabhakar; Valliappan Muthu; Inderpaul S. Sehgal; Sahajal Dhooria; Ashutosh N. Aggarwal; Kuruswamy T. Prasad (Lung India)