DermatomyositisPolymyositisMyositisMusclesMuscle, SkeletalParaneoplastic SyndromesLung Diseases, InterstitialMuscle ProteinsMuscle, SmoothMuscle Fibers, SkeletalMuscle WeaknessMuscle, Smooth, VascularMediastinal EmphysemaMuscle DevelopmentMuscle ContractionPanniculitisHistidine-tRNA LigaseAutoantibodiesMuscle FatiguePrednisoloneMyositis, Inclusion BodyMuscle Fibers, Fast-TwitchLupus Erythematosus, CutaneousMuscle DenervationRheumatic DiseasesMuscle Fibers, Slow-TwitchBiopsyCreatine KinaseMyocytes, Smooth MuscleImmunoglobulins, IntravenousImmunosuppressive AgentsMuscular DiseasesMitochondria, MuscleSkinConnective Tissue DiseasesNeck MusclesOculomotor MusclesMicroscopic AngioscopyTelangiectasisMuscle, Striated