In re E.I. Du Pont De Nemours & Co. C-8 Personal Injury Litig.  ·  2016-04-28  ·  S.D. Ohio  ·  pin 605 F. Supp. 2d at 1142

"Standing alone, the presence of a known risk factor is not a sufficient basis for ruling out idiopathic origin in a particular case, particularly where most cases of the disease have no known cause."