Study of Radium-223 Dichloride Versus Placebo and Treatment With Exemestane / Everolimus in Subjects With Bone Predominant HER2 (Human Epidermal Growth Factor Receptor 2) Negative Hormone Receptor Positive Metastatic Breast Cancer

Study of Radium-223 Dichloride Versus Placebo and Treatment With Exemestane / Everolimus in Subjects With Bone Predominant HER2 (Human Epidermal Growth Factor Receptor 2) Negative Hormone Receptor Positive Metastatic Breast Cancer