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Funding This study was supported by grants from the National Health Research Institutes (NHRI-98A1-PDCO-0307101), Center of Excellence for Environmental Medicine, Kaohsiung Medical University, (KMU-EM-98-1-1) and the National Science Council (NSC97–2314-B-037-007 and NSC97–3112-B-400-001).
Competing interests None.
Patient consent Obtained.
Ethics approval This study was conducted with the approval of the Institutional Review Boards of Kaohsiung Medical University, Kaohsiung Chang-Gung Memorial Hospital, the National Health Research Institutes (KMU-IRB:93-063 and NHRI-EC:0940102) and Ethics and Research Committee of the Ministry of Health and Medical Services in the Solomon Islands in September 2006.
Provenance and peer review Not commissioned; externally peer reviewed.
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