Very well described paper. However, a few minor edits: Please be consistent with formatting of numbers in abstract. Seventy can be described as 70 when 71 is described as a number. Similar for twenty-seven (27), thirty percent (30%). Please be consistent throughout the abstract and paper for numbers greater than nine. I don't see any statistical methods described in the methods section of abstract. Please describe how you got the result numbers and statistics. Background section: Please reference initial sentences. Line 107 - Please cite 'reported elsewhere' and 'reported here' Numbers in results section: Check first comment above