An Open-label, Randomized, Single-dose Study to Evaluate the Safety, Tolerability, and Pharmacokinetics of AMG 785 Administered as a Single 3-mL (70 mg/mL) Subcutaneous Infusion or Three 1-mL Pre-filled Syringe Injections (70 mg/mL) in Healthy Subjects and to Characterize the Inline Pressure of a 3-mL Subcutaneous Infusion of AMG 785 in Older Women