Chromosome coordinates submitted on NCBI36(hg18) are first remapped to GRCh37(hg19)
then matched to current dbSNP rs numbers for which current attributes are reported.
NCBI36(hg18)/GRCh37(hg19) selection is ignored for HGVS format since the HGVS
expression has the specific sequence accession and version. Please note if a
submitted NCBI36 (hg18) position does not have reciprocal 1:1 mapping to GRCh37 (hg19)
it will be dropped from the report; in our next release of the software we will make
sure all submitted locations are included in the report. You can try to use the
NCBI Remap service to find a suitable GRCh37 location
for your variant.