About the Authors

Pradeepa Jayawardane

To whom correspondence should be addressed. E-mail: pradeepajayawardane@yahoo.co.uk

Affiliations South Asian Clinical Toxicology Research Collaboration (SACTRC), Faculty of Medicine, University of Peradeniya, Peradeniya, Sri Lanka , Department of Pharmacology, Faculty of Medical Sciences, University of Sri Jayawardenepura, Nugegoda, Sri Lanka

Andrew H Dawson

Affiliations South Asian Clinical Toxicology Research Collaboration (SACTRC), Faculty of Medicine, University of Peradeniya, Peradeniya, Sri Lanka , School of Population Health, University of Newcastle, Newcastle, New South Wales, Australia

Vajira Weerasinghe

Affiliation South Asian Clinical Toxicology Research Collaboration (SACTRC), Faculty of Medicine, University of Peradeniya, Peradeniya, Sri Lanka

Lakshman Karalliedde

Affiliations South Asian Clinical Toxicology Research Collaboration (SACTRC), Faculty of Medicine, University of Peradeniya, Peradeniya, Sri Lanka , King's College London, Department of Public Health Sciences, School of Medicine, London, United Kingdom , Chemical Hazards and Poisons Division, Health Protection Agency, London, United Kingdom

Nicholas A Buckley

Affiliations South Asian Clinical Toxicology Research Collaboration (SACTRC), Faculty of Medicine, University of Peradeniya, Peradeniya, Sri Lanka , Australian National University, Canberra, Australian Capital Territory, Australia

Nimal Senanayake

Affiliation South Asian Clinical Toxicology Research Collaboration (SACTRC), Faculty of Medicine, University of Peradeniya, Peradeniya, Sri Lanka

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

PJ participated in the design and planning of the study, drafted the study proposal, collected patient information, carried out the electrophysiological studies and clinical examinations, analyzed and interpreted data, interpreted evidence, wrote the first draft, and took part in revising and finalizing the paper. PJ had full access to all the data in the study and had final responsibility for the decision to submit for publication. AHD participated in the design and planning of the study, edited and revised the study proposal, supervised the study, interpreted results, interpreted evidence, edited the paper, and took part in revising the paper and approved the final version. VW participated in the design and planning of the study, edited and revised the study proposal, supervised the study, and approved the final version. LK interpreted evidence, edited the paper, and took part in revising the paper and approved the final version. NAB participated in the design and planning of the study, interpreted evidence, edited the paper, and took part in revising the paper and approved the final version. NS participated in the design and planning of the study, edited and revised the study proposal, supervised the study, interpreted results, interpreted evidence, edited the paper, and took part in revising the paper and approved the final version.