About the Authors

Frank W Rockhold

To whom correspondence should be addressed. E-mail: ronald.l.krall@gsk.com (RLK), E-mail: frank.w.rockhold@gsk.com (FWR)

Affiliation GlaxoSmithKline, King of Prussia, Pennsylvania, United States of America

Ronald L Krall

To whom correspondence should be addressed. E-mail: ronald.l.krall@gsk.com (RLK), E-mail: frank.w.rockhold@gsk.com (FWR)

Affiliation GlaxoSmithKline, King of Prussia, Pennsylvania, United States of America

Competing Interests

The authors have declared that no competing interests exist.