A multicentric study on epidemiology of chronic obstructive pulmonary disease and its relationship with tobacco smoking and environmental tobacco smoke exposure.
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B. Shah | Rajesh Kumar | A. Aggarwal | G. D'Souza | S. Jindal | D. Gupta | V. Vijayan | K. Chaudhry | S. Katiyar | B. Shah | R. Kumar | S. Chhabra | Vijayan Vk | R. Kumar | R. Kumar | Katiyar Sk