Analytic Hierarchy Process for Determining the Most Important Factors to Empower Elderly People in Taking an Active Role in Their Health: Study Design. - Giuseppe Fico; María Teresa Arredondo; Estibaliz Gamboa Moreno; Lourdes Ochoa de Retana García; Manuel Serrano-Gil; Nicola Cornally; D. William Molloy (IWAAL, 2014)