Missing Data ......................................................................................................................... 24 6.4. Visit Windows ....................................................................................................................... 24 6.5. Pooling of Centres ................................................................................................................. 25 6.6. Subgroups ............................................................................................................................ 26 6.7. SAP Version control ............................................................................................................. 26 7. DEMOGRAPHIC, OTHER BASELINE CHARACTERISTICS AND MEDICATION ...................................................................................................... 27 7.1. Patient Disposition and Withdrawals .................................................................................... 27 7.2. Demographic and Other Baseline Characteristics ................................................................ .