The use of a limited list of chronic diseases may introduce an important bias in the prevalence estimates of multimorbidity.
Animal models may introduce potentially important concepts related to the mechanisms involved in tumor recurrence associated with surgical stress, specifically hepatic I/R injury.
Differences in radiological progression may depend on the criteria used: 100% [ 26], 30% [ 21] or 25% increase [ 22] in hematoma dimension, but different cuts and angulation may introduce an important bias with the use of strict criteria, such as a 25%to30%0% enlargement [ 11].
The high dropout rate may have also introduced important systematic bias as the students who continued on in the trial may have been more motivated learners, recognised the importance of learning EBM skills, or were previously familiar with critical appraisal.
First, information about disaster exposure was collected three weeks post-disaster, which was a major advantage since delay in data collection may introduce recall bias and important data may be lost forever.
In a real-world setting, switching patients to another treatment regimen may introduce confounding by indication, an important limitation to observational studies reporting on patients changing their treatment regimens, including the study described here.
This indicates that whole genome amplification after digestion in DMH and MMASS may introduce PCR bias; thus, it is important when using those two assays to take this into consideration for evaluating results.
Due to censoring, this approach is not exact and may introduce some bias, but should still help to preserve important relationships in the data.
Moreover, quantification of the effects of previously overlooked features is important to gauge the bias these may introduce to studies if ignored.
