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Because the sampling procedure is a linear one and because we sought a basis for the sampled space, we performed Principal Components Analysis using Singular Value Decomposition.
In addition, it is likely that only serum samples were collected to determine if AES was caused by JEV infection because the sampling procedure for serum is simpler than that for CSF.
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Use of gas chromatography and mass spectrometry (GC MS) for cancer screening may, in practice, be problematic, not only because of the sampling procedure but also because of difficult interpretation of the results.
Comparison of the intervention group and control group at baseline (table 1) showed no sex difference but a significantly different age distribution, which was expected because of the sampling procedure.
The problem occurs either because the sampling procedures (telephone number selection and/or respondent selection) or differential non-cooperation distorts the sample distributions.
We excluded seventeen women (17/115 or 14.8%) who had given their consent for participation in the study, from the analysis, because they refused part of the sampling procedure, or because of incomplete or inadequate sampling, including delay between vaginal and blood sampling, or because of early (missed) abortion.
One of the limitations of this study is the sampling procedure because it was not random; the participants may not be a true representative to the female drug user population in the study region.
The sampling procedure was chosen because the designated hospital departments agreed to participate in the study since an academic service partnership was established between the two university hospitals and the Institute of Nursing Science of the University of Basel.
The sampling procedure is adaptive.
A power calculation preceded the sampling procedure.
The sampling procedure has been reported [ 17].
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