Bullying in school has long been a concern in studies in the West.
Factors that contribute to variation in nectar sugar composition, nectar concentration and volume have been a central concern in studies of pollinator assemblages in angiosperms.
A major concern in studies using cultured primary neurons is that differences in culture conditions, handling procedures and stimulation paradigms will cover the real dynamics of nucleocytoplasmic shuttling in response to synaptic activity.
Multiple testing is a major concern in studies of genetic epidemiology.
However, heterogeneity is always a concern in studies of human tumour tissue.
It is also of particular concern in studies that focus on symptoms.
Survival bias is a concern in studies that examine the effect of time to treatment initiation.
The concern in studying the progression of functional disability in longitudinal studies is the potential confounding by age-associated changes.
The BRFSS does not contain questions about former drinking, a longstanding concern in studies of health effects of alcohol [ 25].
Another limitation of this study is the use of proxy respondents, a common concern in studies of brain cancer, given the incapacitating nature of the disease.
