NAT2 and tuberculosis: Among these 37 articles, 25 articles were excluded for the following reasons, including (i) articles did not have NAT2 genotype or no SNP information of NAT2 genotype was available (n = 18), (ii) NAT2 genotype was carried out; however, it was not included as a covariate for isoniazid PopPK modelling building (n = 1), (iii) the patient population of the study was not having TB (n = 2), (iv) full text of the articles was not available (n = 1), (v) was not a PopPK study (n = 1), and (vi) nonparametric approach was used for isoniazid PopPK modelling (n = 2).