1. DR. MOEWARDI GENERAL HOSPITAL, SURAKARTA, INDONESIA; UNIVERSITAS SEBELAS MARET, SURAKARTA, CENTRAL OF JAVA, INDONESIA
2. UNIVERSITI TEKNICAL MALAYSIA MELAKA, MELAKA, MALAYSIA
3. UNIVERSITAS JENDERAL SOEDIRMAN, PURWOKERTO, CENTRAL OF JAVA, INDONESIA
4. UNIVERSITAS JENDERAL SOEDIRMAN, PURWOKERTO, CENTRAL OF JAVA, INDONESIA; PROF. DR. MARGONO SOEKARJO GENERAL HOSPITAL, PURWOKERTO, INDONESIA