Emphysema - References

References:

1. Emphysema - (http://www.mayoclinic.org/diseases-conditions/emphysema/basics/definition/con-20014218)
2. Chronic obstructive pulmonary disease - (https://en.wikipedia.org/wiki/Chronic
   _obstructive_pulmonary_disease)
3. Chronic Obstructive Pulmonary Disease (COPD) - (https://www.thoracic.org/patients/patient-resources/resources/copd-intro.pdf)
4. What is Emphysema? - (http://www.lung.org/lung-health-and-diseases/lung-disease-lookup/emphysema/)

Author: Dr. Lakshmi Venkataraman

Editor: Dr. Simi Paknikar

Technically Checked by: Lingaraj