$sth_mlg_addr_duplicate_check->execute($fields[17],$fields[18],$fields[19],$fields[20],$fields[21],$fields[22],$fields[23])
      or warn "While checking for duplicate mailing address $fields[17]; $fields[19] $fields[20]: " . $dbh->errstr;
    ($mlg_addr_id) = $sth_mlg_addr_duplicate_check->fetchrow_array();

    my $mlg_id;
    if(!defined($mlg_addr_id) && length($fields[20]) == 2){
      $sth_insert_mlg_addr->execute($fields[17],$fields[18],$fields[19],$fields[20],$fields[21],$fields[22],$fields[23])
        or warn "While inserting new mailing address |$fields[17]|; |$fields[19]| |$fields[20]|, with id |$mlg_addr_id|: " . $dbh->errstr;
      $sth_mlg_addr_duplicate_check->execute($fields[17],$fields[18],$fields[19],$fields[20],$fields[21],$fields[22],$fields[23])
        or warn "While checking for duplicate mailing address |$fields[17]|; |$fields[19]| |$fields[20]|: " . $dbh->errstr;
      ($mlg_addr_id) = $sth_mlg_addr_duplicate_check->fetchrow_array();
      $mlg_id = $mlg_addr_id;
    } else {
      $mlg_id = $mlg_addr_id;
      # print STDERR "\$mlg_addr_id is already defined as $mlg_addr_id.\n";
    }