11.   Although they said other factors might play a role, they theorized that drinking over the weekend could be one of the causes.

12.   And he says other factors may play a role, including poverty, pollution, and poor prenatal care, nutrition and health care.

13.   As much as doctors may try to avoid it, when we decide whether to involve officials in a case, social factors inevitably play a role.

14.   Attraction may have its biological elements, but other factors play some role as well.

15.   A definitive answer is impossible to give, but both factors played a part.

16.   Ackerman thinks all those factors played a role in the drop.

17.   All these factors play their part in the Asia Society show.

18.   But more subjective factors also play a role.

19.   But socioeconomic factors also play a part.

20.   But, he believes, other factors played a bigger role and trends show that those factors will soon weaken.