Efektifitas Model Keperawatan Pendampingan Berbasis Budaya Minang, Meningkatkan Kualitas Asuhan, Status Kesehatan, Kepuasan dan Kualitas Hidup Lansia di PSTW Sumbar = Effectiveness of Nursing Models : Culture-based Assistance to Improve Quality of Care, Health Status, Life of Satisfaction and Quality of Life, in The Institutional-care of West Sumatera