Research Article   dx.doi.org/10.18081/2333-5106/015-08/523-533 Received January 06, 2018; Accepted April 12, 2018; Published May 22, 2018 Cheng Chen,  Guo-Wei Feng,  Hui  Zeng,  Shiheng Zhang 1  Abstract The objective is chemical analysis instruments and the changes in nephrolithiasis characteristics over decades. Information from a longitudinal data set could help reveal factors associated with a high incidence of nephrolithiasis. […]