The Fred Below study is good, but only 2012.  "More complete" = more variables?  -- the Kitchen Sink study is important because of the depth of the data (many site-yrs) encompassing a huge geography and multiple growing seasons.  So we need to give it a lot of weight, unless there is some problem with their methodology.  Otherwise, we just end up focusing on studies where we like the outcome ;-)  . . . i.e., we subconsciously place more emphasis on studies that support our cherished views, and ignore or forget the contrary ones.