SOD1 and gallstones: SOD and Portal hypertension are important risk factor of GSD as reported by Chawla et al and Sarin et al, was not assessed in our study [23, 24] Although ethnicity was considered in our study but it was a single center study based on study population of a city, so there is further need of large multicenter study to assess true frequency and prevalence of gallstones with respect to ethnicity in our country.