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The Additional file 1 Online appendix to this paper provides a detailed description of survey design, implementation and representativeness.
This year's results are based on 4,276 responses to a web-based survey (see above chart for a description of survey methodologies).
A detailed description of survey design and sampling has been presented elsewhere [ 11, 24, 25].
A detailed description of survey methods and data collection procedures has been published elsewhere (National Center for Health Statistics 1996).
Given the description of survey methodologies as well as discussions with individuals in Serbia who administered the surveys, the data has been deemed as both valid and reliable.
Additional description of survey methods, a map of the distribution of As, maps of the distribution of E. coli in January−April and May−August, As toxicity studies, comparisons of E. coli and population density for different categories of wells and As concentrations, and the characteristics and E. coli data for all 125 shallow wells that were monitored.
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For a detailed description of the survey and the survey procedures (see online supplementary file).
Prior to taking the anonymous survey, parents and students were given a description of the survey and its purpose and were told that the survey was optional.
This is followed by a description of the survey methodology for this study and the results of the survey before turning to the discussion section and conclusions with pointers to future directions for research in this area.
A representative sample of 800 households of the HDSS population was drawn in 2000 (39) and updated in 2003 to 990 households (40), which has been followed-up as a panel survey ever since (for a description of the survey design and questionnaires, see Würthwein 39, 41).
The reader is referred to Castaigne et al. [29] for a more detailed description of the survey and descriptive statics of the sample.
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