THE OVERVIEW SURGICAL SITE INFECTION OF PASCA OPEN SURGICAL OF URINARY STONE AT ARIFIN ACHMAD GENERAL HOSPITAL OF RIAU PROVINCE 1 JANUARY – 31 DECEMBER 2014 PERIOD - M. Irvan Noorrahman; Dimas Pramita Nugraha; Afdal (Jurnal Online Mahasiswa (JOM) Bidang Kedokteran, 2016)