48 For Hong Kong, the actual impact from spatial variation is likely minimal given the geographical compactness of this city (1106 km 2 , the fourth most densely populated area in the world) and its efficient transport network. However, temporal variation is likely to be significant given the recent advances in communication technology and the high saturation of smartphone usage in Hong Kong.
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Epidemiological factors associated with health knowledge of three common eye diseases: A community-based pilot survey in Hong Kong.
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