1. Department of Respiratory Medicine, Vallabhbhai Patel Chest Institute, University of Delhi, Delhi, India.
2. Department of Radiology and Imaging, Saket City Hospital, Saket, New Delhi, India.
Recebido:23 fevereiro, 2015.
Aprovado: 28 julho, 2015.
Trabalho realizado no Department of Respiratory Medicine, Vallabhbhai Patel Chest Institute, University of Delhi, Delhi, India.