refine based on https://software.broadinstitute.org/gatk/best-practices/bp_3step.php?case=GermShortWGS&p=2
refine based on https://software.broadinstitute.org/gatk/best-practices/bp_3step.php?case=GermShortWGS&p=2
shengqh/ngsperl,shengqh/ngsperl,shengqh/ngsperl,shengqh/ngsperl