Aghaei,M , , Gharibdost,F , , Zayeni,H , , Akhlaghi,M , , Sedighi,S , , Rostamian,A , , Aghdami,N , and Shojaa,M . "A survey and comparison of ET-1 level in scleroderma patients with and without pitting ulcer", Pars Journal of Medical Sciences, 9, 1, 2022, 23-27. doi: 10.29252/jmj.9.1.23