Mixed connective tissue disease (MCTD) is an overlap syndrome first defined in 1972 by Sharp et al. In this original study. the portrait emerged of a connective tissue disorder sharing features of systemic lupus erythematosus. systemic sclerosis (scleroderma) and polymyositis. https://www.bekindtopets.com/quick-grab-Canine-Spectra-KC-3-Single-Dose-great-price/