Erratum to: Scope and relevance of a pulmonary biopharmaceutical classification system AAPS/FDA/USP Workshop March 16-17th, 2015 in Baltimore, MD - Jayne E. Hastedt; Per Bäckman; Andrew R. Clark; William Doub; Anthony Hickey; Guenther Hochhaus; Phil J. Kuehl; Claus-Michael Lehr; Peter Mauser; Jason McConville; Ralph Niven; Masahiro Sakagami; et al. (SpringerOpen, 2016)