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Published in The Scientific World Journal, v. 2012, article ID 152923, p. 1-3.

© 2012 Daniel T. L. Shek et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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The preparation for this paper and the Project P.A.T.H.S. were financially supported by the Hong Kong Jockey Club Charities Trust.

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