def get_deleterious(pop_path_file):
    """ Returns dict of rsXXXX ids from the pop_deleterious.txt file and the number of cases in the population
    """
    deleterious = {}
    with open(pop_path_file, 'rt') as p:
        for line in p:
            cols = line.split("\t")
            for snp in cols[2:]:
                snp_key = snp.strip()
                if snp_key not in deleterious:
                    deleterious[snp_key] = 0
                deleterious[snp_key] += 1
    return deleterious