def get_genetic_map_HapMapII_GRCh37(self):
        """ Get International HapMap Consortium HapMap Phase II genetic map for Build 37.

        Returns
        -------
        dict
            dict of pandas.DataFrame HapMapII genetic maps if loading was successful, else None
        """
        if self._genetic_map_HapMapII_GRCh37 is None:
            self._genetic_map_HapMapII_GRCh37 = self._load_genetic_map(
                self._get_path_genetic_map_HapMapII_GRCh37()
            )

        return self._genetic_map_HapMapII_GRCh37
Get International HapMap Consortium HapMap Phase II genetic map for Build 37.

        Returns
        -------
        dict
            dict of pandas.DataFrame HapMapII genetic maps if loading was successful, else None