Please note that having a paper in the ncbi database, which is maintained by the NIH, in no way means that the paper is from the NIH. The database merely lists published information. Both of the papers you cite are from companies that do studies for hire, not the NIH. Although it is still possible that there may be accurate data contained in them, the studies' provenance makes the results less believable than if they were done by people with no financial interest in the conclusions.