It does not polemicize or make unsubstantiated claims (if anything, it is almost quite dry).
Evidence is also unsubstantiated as yet for alternative aetiological hypotheses such as autoimmunity, atopy, and genetic predisposition.
He recognises that both assumptions are dangerous, whereas the first is contentious and the second unsubstantiated.
Disappointingly, chapters 2-5 are also riddled with inaccurate information, unsubstantiated claims and a clear lack of knowledge of published literature in the field.
Once again, this claim is unsubstantiated, and several salient points should be considered.
Some of these lead the reader to further evidence, while others lead only to further unsubstantiated statements.
Much of the discussion of the relevance of environmental phenomena for economic performance and development is still unsubstantiated, however.
Sceptics will contend that our first two claims are unsubstantiated assertions.
