Secondly, there may be a selection bias, because we selected the youngest one when there were two or more eligible children in the surveyed household.
One of the main limitations of the present selected cohort registry study may be a selection bias for patients subjected to coronary intervention and hypothermia.
There could be a selection bias because of the way units were selected, as only health units with large numbers were selected.
The patients selected which drugs are injected under sufficient explanation, which would be a selection bias.
Furthermore, there could be a selection bias for patients with SARD, since these patients were recruited by aβ2GPI IgG positivity.
Since the dependent variables in the wage regressions (regular pay and bonuses) are reported only by working people, there might be a selection bias.
Second, and potentially more important, there could be a selection bias if a large number of rural households had (permanently) migrated elsewhere between 2002 and 2008.
3The effect of employment on SWB is not properly identified as we only observe transitions, and there might be a selection bias on transitions: something else can be causing both transitions and unhappiness.
As the subset of genes used in the final form of the rule have not been randomly selected but rather chosen according to some criterion designed to reflect the predictive power of the rule, there will be a selection bias inherent in estimates of the error rates of the rules if care is not taken.
It is possible that the inclusion criteria were such that this resulted in higher numbers, and there may be a selection bias especially since 11C-acetate PET/CT was a new method at the time and is still used only in cases with risk of pelvic lymph node involvement and where curative radiotherapy is the intended treatment.
Although we included all patients with AC and TC which received SR PET/ceCT at our ENETS center in this analysis, there will probably be a selection bias due to the fact that rather patients with suspicion for relapse or metastatic disease will have been referred for SR PET/CT.
