<qa>  What will be rated for severity, likelihood of relation to the study?Analysis relevant to the primary aim of the study will be conducted as follows: The demographic characteristics of candidates referred, subjects enrolled, and dropouts will described. Descriptive statistics, both aggregate and per treatment arm, will be computed for data on retention and compliance with treatment, and on the use of concurrent medications. Each adverse events will be characterized by subject demographics and by treatment arm, and will also be rated for severity, likelihood of relation to the study, and expected versus unexpected. 