Two populations were defined as below:
* Population I: Patients enrolled prior to the protocol amendment 1, who received bimagrumab 70 mg, 210 mg or 700 mg in the core study, were randomly assigned to two subgroups within each of three treatment arms to either receive bimagrumab at the same dose level or placebo. Patients receiving placebo in the core study continued receiving placebo in the extension study.
* Population II: Patients enrolled after protocol amendment 1, who received bimagrumab 700 mg or placebo in the core study, did not receive study medication in the extension study and were followed-up per schedule defined in this protocol amendment.
