Use this field to specify additional variables across the meta-analysis that identify the accession numbers for the markers.This field is used only when one or more of the data sets selected, after the first, uses a variable with another name for the Accession Number Variable. All variable names for the 2nd through the last data set must be specified here.
For example, to specify the additional chromosome variables AccessNum_1 and AccessNum_2, type AccessNum_1 AccessNum_2 in the text box, as shown below: