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Did you mean sera a study group[Corporate Author] (4 results)?
Tackling missing radiographic progression data: multiple imputation technique compared with inverse probability weights and complete case analysis.
Descalzo MÁ, Garcia VV, González-Alvaro I, Carbonell J, Balsa A, Sanmartí R, Lisbona P, Hernandez-Barrera V, Jiménez-Garcia R, Carmona L; SERAP Study Group. Descalzo MÁ, et al. Rheumatology (Oxford). 2013 Feb;52(2):331-6. doi: 10.1093/rheumatology/kes245. Epub 2012 Sep 29. Rheumatology (Oxford). 2013. PMID: 23024115