1437
Review of all reported cases of the use of ATRA in pregnancy revealed no serious adverse outcomes or congenital anomalies although only very few cases had exposure in the first trimester.
 ( adverse event: revealed ,  in pregnancy: Subject, pregnancy: Subject.Disorder, adverse outcomes or congenital anomalies: Effect, ATRA: Treatment, ATRA: Treatment.Drug) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: adverse event,potential therapeutic event, Arguments type: Treatment.Disorder,Treatment.Time_elapsed,Treatment.Dosage,Subject.Race,Treatment.Drug,Treatment.Route,Subject.Disorder,Treatment.Freq,Treatment,Effect,Subject.Population,Treatment.Duration,Combination.Drug,Subject,Subject.Age,Subject.Gender. 
Text: {0} 
Answer:
 ( adverse event: revealed ,  in pregnancy: Subject, pregnancy: Subject.Disorder, adverse outcomes or congenital anomalies: Effect, ATRA: Treatment, ATRA: Treatment.Drug) 