Please assess the completion status of the following clinical trial:

Trial Title: Safety and Immunogenicity of a Booster Dose of GlaxoSmithKline (GSK) Biologicals' Hepatitis B Vaccine

Study Design Characteristics:
- Allocation: NON_RANDOMIZED
- Intervention Model: SINGLE_GROUP
- Observational Model: None
- Primary Purpose: PREVENTION
- Time Perspective: None
- Masking: NONE
- Phase: PHASE4
- Number of Arms: 4.0

Eligibility Criteria:
Inclusion Criteria:~* Subjects who the investigator believes that they can and will comply with the requirements of the protocol should be enrolled in the study.~* A male or female adult who received the complete neonatal primary vaccination course of hepatitis B vaccine (Engerix™-B), in the 103860/272 primary study approximately 20 years earlier.~* Documented level of anti-HBs antibody concentrations \< 100 milli-international units per milliliter (mIU/ml) at the previous long-term time-point for which serological results are available for that subject.~* Written informed consent obtained from the subject.~* Healthy subjects as established by medical history and clinical examination before entering into the study.~* If the subject is female, she must be of non-childbearing potential or if she is of childbearing potential, she must practice adequate contraception for 30 days prior to vaccination, have a negative pregnancy test and continue such precautions for 2 months after completion of the hepatitis B challenge dose.~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 dose of study vaccine, or planned use during the study period.~* Chronic administration (defined as more than 14 days) of immunosuppressants or other immune-modifying drugs within six months prior to the hepatitis B vaccine challenge dose.~* Planned administration/ administration of a vaccine not foreseen by the study protocol during the period starting from 30 days before the hepatitis B vaccine challenge dose and ending 30 days after.~* Subjects who received a booster dose of hepatitis B vaccine outside the context of this study between the long-term time-point at the documented level of anti-HBs antibody concentrations and the current challenge dose study visit.~* Concurrently participating in another clinical study, at any time during the study period, in which the subject has been or will be exposed to an investigational or a non-investigational product.~* History of allergic disease or reactions likely to be exacerbated by any component of the vaccine.~* Any confirmed or suspected immunosuppressive or immunodeficient condition, including human immunodeficiency virus (HIV) infection.~* Acute disease at the time of enrolment.~* Acute or chronic, clinically significant pulmonary, cardiovascular, hepatic or renal functional abnormality, as determined by physical examination or laboratory screening tests.~* Administration of immunoglobulins and/or any blood products within the three months preceding the hepatitis B vaccine challenge dose or planned administration during the study period.~* Pregnant or lactating female.~* Female planning to become pregnant or planning to discontinue contraceptive precautions.

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

Study Arms:
- Group 1 (Type: EXPERIMENTAL): Neonates from mother HBsAg (+) and HBeAg (+) had received HBV vaccine at Month 0, 1, 2, 12, 60 (5 doses)
- Group 2 (Type: EXPERIMENTAL): Neonates from mother HBsAg (+) and HBeAg (+) had received HBV vaccine at Month 0, 1, 2, 12 (4 doses)
- Group 4 (Type: EXPERIMENTAL): Neonates from mother HBsAg (+) and HBeAg (-) had received HBV vaccine at Month 0, 1, 2, 12 (4 doses)
- Group 6 (Type: EXPERIMENTAL): Neonates from mother HBsAg (-) and HBeAg (-) had received HBV vaccine at Month 0, 1, 2, 12 (4 doses)

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

Answer: outcome: complete