The number of short-term illnesses and stress-related psychological disorders was higher than usual in the months following an earthquake and this suggest that b. experiencing a very stressful event increases a person's vulnerability to illness.
The short-term illnesses and stress-related psychological disorders after an earthquake is that people will be living with the trauma after the incident.
In this case, there is usually experiencing a very stressful event increases a person's vulnerability to illness.
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