@staticmethod
def _make_record_id(record):
    """Make record id based on CHROM POS REF ALT"""
    alt = record.ALT[0]
    ref = record.REF
    if len(alt) > 10:
        alt = alt[0:7] + '...'
    if len(ref) > 10:
        ref = ref[0:7] + '...'
    record_id = '{}_{}_{}_{}'.format(record.CHROM, record.POS, ref, alt)
    return record_id
