Clinical Risk Groups Analysis for Chronic Hypertensive Patients in Terms of ICD9-CM Diagnosis Codes. - Javier Fernández-Sánchez; Cristina Soguero-Ruíz; Pablo de Miguel-Bohoyo; Francisco Javier Rivas-Flores; Ángel Gómez-Delgado; Francisco Javier Gutiérrez-Expósito; Inmaculada Mora-Jiménez (PhyCS, 2017)