def persist_rmas_user_ethics_user_link(rmas_user_id, ethics_user_id):
    """
        This function persists the link between the unique identifier that is used to identify a user
        in RMAS, to the unique identifier that represents the same user in the OpenEthics system.
        
        The persistance is carried out using a MongoDB database (oe_rmas_adapter), and the 'people_links' 
        collection
    """
