Determining Minimum Skill Achievements in Advanced Clinical Clerkship(Externship) in School of Medicine Using Logbooks oleh Maryam Avizhgan, Athar Omid, Mostafa Dehghani, Atoosa Esmaeili, Ali Asilian, Mohammad Reza Akhlaghi, Parvaneh Nasr, Marzieh Hosseini, Vahid Ashourioun