Please assess the completion status of the following clinical trial:

Trial Title: Safety and Immunogenicity of the Zoster Vaccine GSK1437173A in Elderly Subjects

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: PREVENTION
- Time Perspective: None
- Masking: SINGLE
- Phase: PHASE2
- Number of Arms: 5.0

Eligibility Criteria:
Inclusion Criteria:~* Subjects who the investigator believes that they can and will comply with the requirements of the protocol.~* A male or female aged 60 years or older at the time of the first vaccination.~* Written informed consent obtained from the subject~Exclusion Criteria:~* Use of any investigational or non-registered product (drug or vaccine) other than the study vaccine(s) within 30 days preceding the first injection with study vaccine, or planned use during the study period.~* Chronic administration (defined as more than 14 days) of immunosuppressants or other immune-modifying drugs during the study period, except inhaled and topical steroids are allowed.~* Administration or planned administration of a vaccine not foreseen by the study protocol within 2 weeks of the first study vaccine injection, with the exception of the influenza vaccine, which can be administered 1 week preceding or 1 month after the first study vaccine injection.~* Previous vaccination against HZ.~* History of herpes zoster (Shingles).~* Any confirmed or suspected immunosuppressive or immunodeficient condition, based on medical history and physical examination (no laboratory testing required).~* History of allergic disease or reactions likely to be exacerbated by any component of the vaccine.~* Acute disease at the time of enrolment.~* Acute or chronic, clinically significant pulmonary, cardiovascular, hepatic or renal functional abnormality, as determined by subject's medical history or physical examination as assessed by the investigator.~* Administration of immunoglobulins and/or any blood products within the 3 months preceding the first injection of study vaccine or planned administration during the study period.~* History of or current drug and/or alcohol abuse.

- Gender: ALL
- Minimum Age: 60 Years
- Maximum Age: None
- Healthy Volunteers: t

Study Arms:
- GSK1437173A _LD Group (Type: EXPERIMENTAL): Healthy male or female subjects aged 60 years or older, who received 2 doses of herpes zoster subunit vaccine (GSK1437173A) low dose (LD) formulation, according to a 0, 2-month schedule. The vaccine was administrated by intramuscular injection (IM) in the upper deltoid site of the left arm.
- GSK1437173A _MD Group (Type: EXPERIMENTAL): Healthy male or female subjects aged 60 years or older, who received 2 doses of herpes zoster subunit vaccine (GSK1437173A) medium dose (MD) formulation, according to a 0, 2-month schedule. The vaccine was administrated by (IM) in the upper deltoid site of the left arm.
- GSK1437173A _HD Group (Type: EXPERIMENTAL): Healthy male or female subjects aged 60 years or older, who received 2 doses of herpes zoster subunit vaccine (GSK1437173A) high dose (HD) formulation, according to a 0, 2-month schedule. The vaccine was administrated by (IM) in the upper deltoid site of the left arm.
- Placebo + GSK1437173A _HD Group (Type: PLACEBO_COMPARATOR): Healthy male or female subjects aged 60 years or older, who received a 1st dose of saline solution and a 2nd dose of GSK1437173A high dose (HD) formulation, according to a 0, 2-month schedule. The vaccine was administrated by (IM) in the upper deltoid site of the left arm.
- GSK1437173A_MODIFIED GROUP (Type: ACTIVE_COMPARATOR): Healthy male or female subjects aged 60 years or older, who received 2 doses of GSK1437173A modified formulation vaccine reconstituted with saline solution, according to a 0, 2-month schedule. The vaccine was administrated by (IM) in the upper deltoid site of the left arm.

Based on this trial design, predict the completion outcome and termination type (if applicable).

Answer: outcome: complete