ID_1 ID_2 missing 0 0 0 NA00001 NA00001 0 NA00002 NA00002 0 NA00003 NA00003 0 NA00004 NA00004 0 NA00005 NA00005 0 NA00006 NA00006 0 NA00007 NA00007 0 NA00008 NA00008 0 NA00009 NA00009 0 NA00010 NA00010 0