The number of proposed class actions over Santa Fe's "natural" tobacco nearly doubled last month, alongside other fast-growing product-liability litigations for claims involving Pfizer's erectile dysfunction drug Viagra, C.R. Bard blood-clot filters and 3M's Bair Hugger surgical blankets.

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Here are some multidistrict litigations that saw the largest percentage of new filings from April 15 until May 16, according to a Reuters analysis of statistics from the U.S. Judicial Panel on Multidistrict Litigation.

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