{"groups":[{"description":"Luspatercept 1.0 mg/Kg SC on Day 1 of each 21-day treatment cycle","id":"FG000","title":"Luspatercept"},{"description":"Placebo (Volume equivalent to experimental arm) SC on Day 1 of each 21-day treatment cycle","id":"FG001","title":"Placebo"}],"periods":[{"dropWithdraws":[{"reasons":[{"groupId":"FG000","numSubjects":"35"},{"groupId":"FG001","numSubjects":"13"}],"type":"Withdrawal by Subject"},{"reasons":[{"groupId":"FG000","numSubjects":"45"},{"groupId":"FG001","numSubjects":"24"}],"type":"Death"},{"reasons":[{"groupId":"FG000","numSubjects":"5"},{"groupId":"FG001","numSubjects":"1"}],"type":"Lost to Follow-up"},{"reasons":[{"groupId":"FG000","numSubjects":"52"},{"groupId":"FG001","numSubjects":"21"}],"type":"Transition to rollover protocol"},{"reasons":[{"groupId":"FG000","numSubjects":"12"},{"groupId":"FG001","numSubjects":"5"}],"type":"Other reasons"}],"milestones":[{"achievements":[{"groupId":"FG000","numSubjects":"153"},{"groupId":"FG001","numSubjects":"76"}],"type":"STARTED"},{"achievements":[{"groupId":"FG000","numSubjects":"4"},{"groupId":"FG001","numSubjects":"12"}],"type":"COMPLETED"},{"achievements":[{"groupId":"FG000","numSubjects":"149"},{"groupId":"FG001","numSubjects":"64"}],"type":"NOT COMPLETED"}],"title":"Overall Study"}],"preAssignmentDetails":"229 participants were randomized and treated."}