Read in input vcf data in VarPROWL format
readVarPROWL(dr, dbOnly, depCut, thred, content, extnum, keepall)
A valid input object
Use dbSNP as filter, default is FALSE, passed from read_vcf
Use a threshold for min depth , default is False
Threshold for min depth, default is 20
Column names in VCF files
The column number or numbers to be extracted from vcf, default is 10; 0 for not extracting any columns
Keep unextracted column in output, default is TRUE, passed from read_vcf
vcf Dataframe from VCF file