Support WBURDrug Companies Hire Troubled Doctors As ExpertsPlay05:35Download AudioNPR StaffProPublicaOctober 19, 2010 SharePfizer, one of the largest drug makers in the U.S., saw $27.8 billion in sales in 2009. Seven drug companies, including Pfizer, have disclosed information about doctors who receive payment for speaking fees related to products they sell. (AP)