def hcp_split(data):
    """ Return label paths for both controls and patients. 

    Parameters
    ----------
    data: list
        List of label paths.

    Returns
    -------
    Returns seperate lists for controls and patients.
    """
    control = []; patient = [];
    [control.append(file[0: file.find('.') + 4]) if file.find('Control') > 0 
    else patient.append(file[0: file.find('.') + 4])
    for file in data]
    return control, patient