(May 4, 2016, 1:24 PM EDT) -- DETROIT — A doctor is unqualified in a product liability action to offer an expert opinion on the material or biomechanical science of crosslinking or on the body’s immunological response to crosslinked materials, a Michigan federal judge ruled April 19 (Robert and Karol Avendt v. Covidien, Inc., No. 11-15538, E.D. Mich.; 2016 U.S. Dist. LEXIS 52034)....