And as with any street drug, there was no way to know exactly what the study participants were taking.

Study participants were followed for more than four years, on average.

At the end, data were available for all but 49 of the original study participants.

The 233 study participants were followed for two years following the death of a close family member or other loved one.

Half of the study participants dropped out before the two years were up.

That means all study participants are given the best current medicine.

The average age of the study participants was 57, and most had graduated from high school.

All study participants were told to stop taking the medication.

The study participants ranged from 24 to 79 years old, with an average age of 47.7.

Following are recommendations made by one or more study participants.