1Department of Pulmonary Medicine, Nilratan Ratan Sircar Medical College, Kolkata, West Bengal, India.
2Department of Pulmonary Medicine, Bankura Sammilani Medical College, Bankura, West Bengal, India.
3Department of Radio Diagnosis, Bankura Sammilani Medical College, Bankura, West Bengal, India.
4Department of Pulmonary Medicine, National Medical College, Kolkata, West Bengal, India.
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