def people_at_risk(dataframe_list):
    """Takes in a list of dataframes from RPC_incidence_pop and adds them.

    Parameters
    ----------
    dataframe_list : List
        List of dataframes containing all the people at risk from multiple
        regions/prefactures.

    Returns
    -------
    pd.core.frame.DataFrame
        Dataframe containing all the people at risk in certain regions
    """
    combined_dataframe = dataframe_list[0]
    for dataframe in dataframe_list[1:]:
        combined_dataframe = combined_dataframe.add(dataframe)
    return combined_dataframe