The authors regret the omission of one of the authors, Jared J. Lindenberger, from the final version of the manuscript. The corrected list of authors and affiliations for this paper is as shown above.
The Royal Society of Chemistry apologises for these errors and any consequent inconvenience to authors and readers.
Footnotes
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Current addresses: S.K.V.: National Institute of Allergy and Infectious Diseases 33 North Dr. Bethesda, MD 20814, USA. J.J.L.: Center for Retrovirus Research and College of Pharmacy, The Ohio State University, Columbus, Ohio 43210, USA.