1. Nir, Y., Paz, A., Sabo, E. & Potasman, I. Fear of injections in young adults: prevalence and associations. Am. J. Trop. Med. Hyg. 68, 341–344 (2003).
2. Rosenstock, L. CDC's National Institute for Occupational Safety and Health, Committee on Education and the Workforce, Subcommittee on Workforce Protections, US House of Representatives. p. Needlestick Injuries Among Healthcare Workers [online], < http://www.cdc.gov/niosh/ndletest.html > (2000).
3. Kermode, M. Unsafe injections in low-income country health settings: need for injection safety promotion to prevent the spread of blood-borne viruses. Health Promot. Int. 19, 95–103 (2004).
4. Kane, A. et al. Transmission of hepatitis B, hepatitis C and human immunodeficiency viruses through unsafe injections in the developing world: model-based regional estimates. Bull. World Health Organ. 77, 801–807 (1999).
5. Tezel, A., Paliwal, S., Shen, Z. & Mitragotri, S. Low-frequency ultrasound as a transcutaneous immunization adjuvant. Vaccine 23, 3800–3807 (2005).