DermatomyositisPolymyositisMyositisLung Diseases, InterstitialParaneoplastic SyndromesHistidine-tRNA LigaseMediastinal EmphysemaMyositis, Inclusion BodyMuscle WeaknessPrednisoloneAutoantibodiesMuscle, SkeletalConnective Tissue DiseasesPanniculitisImmunosuppressive AgentsRheumatic DiseasesCreatine KinaseBiopsyImmunoglobulins, IntravenousAutoimmune DiseasesLupus Erythematosus, CutaneousAdrenal Cortex HormonesScleroderma, SystemicMuscular DiseasesMusclesLactate Dehydrogenases