Rohil, V., Vijayan, V., Kumar, R., Joshi, R., Pavani, P., Paul, S., Sharma, A. and Rahman, M. (2017) “A study on the correlation of matrix metalloproteinase MMP1 in COPD and smoking in the North Indian population”, Asian Journal of Medical Sciences, 8(1), pp. 5-14. doi: 10.3126/ajms.v8i1.16020.