Pfizer has asked the federal judge handling the multidistrict litigation alleging that its antidepressant drug Zoloft causes birth defects to limit a key plaintiffs expert’s testimony to the content of her report.

The plaintiffs responded that Pfizer had kept their expert, Dr. Anick Berard, from explaining her methods during deposition. The drug company now characterizes Berard’s method for citing to scientific studies as flawed, arguing that she “cherry-picked” studies and disregarded ones that didn’t support her proposition that Zoloft can cause birth defects in babies born to women who took the drug while pregnant.