Pengaruh intervensi promosi kesehatan terhadap pengetahuan, sikap dan praktek perilaku hidup bersih dan sehat siswa kelas 4 dan 5 SDN Kembaran Kecamatan Loano Kabupaten Purwerejo Propinsi Jawa Tengah tahun 2012 = the Impact of Health Promotion Interventions to knowledge, attitude and practices of clean and healthy behavior students in grades 4 and 5 Kembaran Elementary School Loano Subdistrict Purworejo District Central Java Province year 2012