def check_keys(in_dict):
    """Checks which keys are present within the input dictionary

    This function looks within the input dictionary and checks
    which keys are contained within it. Then, with these
    keys, it generates a list containing these keys and
    returns this list as output.

    Parameters
    ----------
    in_dict : dict
        Gives the patient information

    Returns
    -------
    list
        Contains the keys within the dictionary
    """
    my_keys = list(in_dict.keys())
    return my_keys