Any GI index which is not determined on an individual level is likely to be useless. http://dx.doi.org/10.1016/j.cell.2015.11.001 http://dx.doi.org/10.1016/j.c

Any GI index which is not determined on an individual level is likely to be useless. http://dx.doi.org/10.1016/j.cell.2015.11.001 http://dx.doi.org/10.1016/j.cell.2015.11.001 http://dx.doi.org/10.1001/jama.2014.16658 http://dx.doi.org/10.1001/jama.2014.16658