HINT: is it clear what the authors are trying to achieve?
- What is the perspective?
- How many options are compared?
- Are both costs and consequences considered?
- What is the time horizon?
Where to look for the information...
Usually the best place to look for this information is in the methods section of a paper and the methods section of the abstract.
In this case it is suggested you look at page 2542 paragraphs 2 and 3.
Click the "Answer 1" link below to find out what we thought.