References

1. Prescribing Information for TWINRIX.
2. Connor BA, Blatter MM, Beran J, Zou B, Trofa AF. Rapid and sustained immune response against hepatitis A and B achieved with combined vaccine using an accelerated administration schedule. J Travel Med. 2007;14:9-15.
3. American Medical Association. Current Procedural Terminology 2013: Standard Edition. Abraham M, Ahlman JT, Boudreau AJ, et al, eds. Chicago, IL: AMA Press; 2012:6-9,338-340.
4. Buck CJ. 2013 ICD-9-CM Professional for Physicians. Vol 1 & 2. St Louis, MO: Saunders; 2012:750-764,913,1059-1083.