The introduction is very good !
On personality we need more detail : how about something on Type C (Temoshok
1987) , Types D + ER (Burne 1999).
On Culture we could add something about hypertension in African/Americans (Cooper
1999).
The Johansson study is a very useful one to highlight.
Can you get hold of any statistics for the workplace stress you quite rightly
mention.
A good level of writing that just needs some additional detail.
Presently in the region of grade C.