It is the introduction part of a research paper.
550 words.
Title of the research: Vaccination against airborne diseases in Arabian Gulf Countries: barriers and motivators
GCC countries: Kingdom of Saudi Arabia, United Arab Emirates, Kuwait, Bahrain, Oman and Qatar.
Vaccinations included in the study: influenza, pneumococcal, pertussis and meningococcal vaccines.
Study aims:
1- Assess the uptake of seasonal influenza, pertussis, pneumococcal and meningococcal vaccines among the public in Arabian Gulf Countries.

2- Explore the facilities and barriers on vaccines uptake.

3- Identify any demographical factors affecting the uptake.

At risk group population is elderly above 65 years, elderly with chronic diseases and any one of any age group with any of the chronic diseases (Diabetes, Asthma, Chronic kidney disease, Cancer, Hypertension, Heart diseases, High cholesterol and Immunosuppression).
Start generally till reaching the aim of the study.
Add recommendation of WHO and CDC.
Also add recommendation of each country regarding each vaccine if available.
Concentrate on influenza and pneumococcal vaccines.
Use the studies from the list as needed, and you can add anything else if relevant.
Use Vancouver referencing style.