The coding categories were modified from pre-existing studies about media coverage of health research and biotechnologies [ 28, 29] and adapted to include issues raised in similar studies [ 30- 32].
Although the items and questions in the proposed questionnaire were adopted from existing studies, the questionnaire was pre-tested with several senior academicians and experts from aviation industries to ensure that the wording and format of the questions were appropriate.
These findings are confirmed using new experimental data from mice, which are genetically distinct from existing studies, illustrating the generality of the model's findings.
However, there is no consistent mortality signal from the existing studies of NSAIDs.
Table 4 briefly summaries the results from some existing studies of dietary acrylamide and breast cancer.
Nevertheless, one can see a general trend from the existing studies.
These associations from the existing studies also reflected the fact that HepG2 cells are derived from a hepatocarcinoma.
However, data concerning these mechanisms in children are scarce and results from the existing studies have been inconsistent [ 9, 10].
In order to increase the sample size of early onset lung cancer patients we included cases from two existing studies.
In addition to patient focus groups, survey dimensions were collated from several existing studies or questionnaires of oncology patients [ 18- 21].
Unfortunately, a recent meta-analysis conducted by the Cochrane Airway Group [ 32] failed to find significant benefit from the existing studies.
