<qa>  What is the name of the kit provided by?For the saliva samples, the subject will be asked to spit out into a sterile container which will be immediately transferred into ice and then stored at - 800C. Collection of the stool samples will be performed based on the guidelines for stool sample collection given for the human microbiome project 16. DNA extraction will be performed from the samples using the DNA extraction kit provided by Qiagen, USA. 