About the Authors

Quinton Johnson

To whom correspondence should be addressed. E-mail: qjohnson@uwc.ac.za

Affiliations South African Herbal Science and Medicine Institute, University of the Western Cape, Bellville, South Africa, The International Centre for Indigenous Phytotherapy Studies, University of the Western Cape, Bellville, South Africa

James Syce

Affiliations South African Herbal Science and Medicine Institute, University of the Western Cape, Bellville, South Africa, The International Centre for Indigenous Phytotherapy Studies, University of the Western Cape, Bellville, South Africa

Haylene Nell

Affiliation Tiervlei Trial Centre, Karl Bremer Hospital, Bellville, South Africa

Kevin Rudeen

Affiliations The International Centre for Indigenous Phytotherapy Studies, University of the Western Cape, Bellville, South Africa, School of Health Professions, University of Missouri-Columbia, Missouri, United States of America

William R Folk

Affiliations South African Herbal Science and Medicine Institute, University of the Western Cape, Bellville, South Africa, The International Centre for Indigenous Phytotherapy Studies, University of the Western Cape, Bellville, South Africa, School of Medicine, University of Missouri-Columbia, Missouri, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

QJ, JS, KR, and WRF made primary contributions to the design and conduct of the study, analysis and interpretation of results, and preparation of the manuscript. HN conducted and controlled the quality of the trial and contributed to the study results.