Tells you all you need to know:
"The authors wish to thank Christopher G. Parkin, CGParkin Communications, Inc., Boulder City, NV, for editorial assistance in preparing this article. Funding for the development of this article was provided by MannKind Corporation...
Author Disclosure Statement
J.P. and S.V.E. have served as a consultants and speakers for MannKind Corporation."
Nothing but a paid ad by a couple of Mannkind's pharmahores.