Multiple Imputation to Deal with Missing Clinical Data in Rheumatologic Surveys: an Application in the WHO-ILAR COPCORD Study in Iran - Mirmohammadkhani, M; Rahimi Foroushani, A; Davatchi, F; Mohammad, K; Jamshidi, A; Tehrani Banihashemi, A; Holakouie Naieni, K (Iranian Journal of Public Health)