. 2021 Jul 3;38(4):307–313. doi: 10.4103/lungindia.lungindia_120_20
Copyright: © 2021 Indian Chest Society
This is an open access journal, and articles are distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 License, which allows others to remix, tweak, and build upon the work non-commercially, as long as appropriate credit is given and the new creations are licensed under the identical terms.
| Never | 0 |
| 1 | 1 |
| 2 | 2 |
| >2 | 3 |