Hearings are being held in Philadelphia federal court this week on the admissibility of the testimony of plaintiffs' expert witnesses in litigation over whether Zoloft caused birth defects. The Legal Intelligencer's Sara Spencer (my former colleague) reports that drugmaker Pfizer is seeking to winnow out some of those experts. Both sides focused on a general causation expert, Dr. Anick Berard, The Legal reports. One defense lawyer said her position puts her "against the world."