I am a new member of Urch, my comment may contain some errors.
I think it is a good essay, you have a considerable amount of sentence structures.
There is something you should notice
1. I personally think you should begin each paragraph of the body with "Firstly" "Secondly" "Thirdly" or " In the first place " ...
2. Your conclusion somehow doesn't connect with the topic.
3. "greatest benefit" --> "greatest benefits"
4. "world health organization" --> "World Health Organization"
5. "less developed countries" --> "developing countries"
6. " less injuries" --> "fewer injuries"
Hope my comment will help you. :)