tokens: Massive focal apoptosis was observed in the medial layers of bi / dil ( mean apoptotic index [ mAI ] , 8.1+/-6.0 ) and tri / dil ( mAI , 8.1+/-8.3 ) compared with tri/0 ( mAI , 0.9+/-1.2 ; P=0.0079 and P=0.037 ) .