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. 2014 Apr 22;9(4):e95395. doi: 10.1371/journal.pone.0095395

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© 2014 Kader Maideen et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

PMC Copyright notice

The above figure shows the sampling method of this research. The sampling frame for this study was obtained from the Department of Statistics (DOS), Malaysia. A multistage stratified random sampling method was used for the selection of enumeration blocks and living quarters in each of the three districts in Selangor.