@classmethod
def load_all(kls):
    """Force immediate load of all metadata"""
    for region_code, loader in list(kls._region_available.items()):
        if loader is not None:
            loader(region_code)
            kls._region_available[region_code] = None
    for country_code, loader in list(kls._country_code_available.items()):
        if loader is not None:
            loader(country_code)
            kls._country_code_available[region_code] = None
