(December 21, 2015, 12:29 PM EST) -- WASHINGTON, D.C. — Plaintiffs on Dec. 11 asked the Judicial Panel on Multidistrict Litigation (JPMDL) to centralize 15 federal lawsuits alleging that Viagra increases the risk of melanoma (In Re: Viagra Products Liability Litigation, MDL Docket No. 2691, JPMDL)....