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