For the second time in two months, The Journal of the American Medical Association says it was misled by researchers who failed to reveal financial ties to drug companies. The latest incident, disclosed in letters to the editor and a correction in Wednesday's journal, involves a study showing that pregnant women who stop taking antidepressants risk slipping back into depression. Most of the 13 authors have financial ties to drug companies including antidepressant makers, but only two of them revealed their ties when the study was published in February.