About the Authors

Corresponding Author


Competing Interests

ER has received research grants from Daiichi, Bayer, and Theravance and has served as a consultant to Pfizer, Theravance, Bayer, Wyeth, Rosetta, and BiondVax. The other authors have declared that they have no competing interests.

Author Contributions

GP prepared the consequent drafts that were circulated among all other authors for evaluation of intellectual content and revised according to individual suggestions. All authors have seen and approved the final version.