To answer such a question large cross-sectional studies are needed including not only OCT measurements.
Cross-sectional studies are needed in Pakistan to appreciate this association with sex and susceptibility to TB with larger sample size.
Because the study is cross-sectional, intervention studies are needed to elucidate whether vitamin D could be used to prevent development of type 2 diabetes.
Large, community-based cross-sectional and cohort studies are needed to investigate rates and determinants of diabetic retinopathy prevalence, incidence and progression across Africa.
Large, community-based cross-sectional and cohort studies are needed to investigate rates and determinants of prevalence of diabetic retinopathy, incidence and progression in Africa.
Extensive cross-sectional and/or longitudinal studies are needed to map the changing developmental landscape and determine the age-appropriate relevance of variables.
Because the epidemiologic evidence available is mostly cross-sectional, prospective epidemiologic studies are needed to understand the health consequences of cadmium exposure and to evaluate the adequacy of current food and environmental safety standards.
Controlling for maternal IQ and other covariates, the results show an inverse relationship between phthalate metabolites and IQ scores; however, given the limitations in cross-sectional epidemiology, prospective studies are needed to fully explore these associations.
In our study, after controlling for maternal IQ and other covariates, the results show an inverse relationship between phthalate metabolites and IQ scores; however, given the limitations inherent in cross-sectional epidemiology, prospective studies are needed to fully explore these associations.
In addition, although CD64 appears to be a surrogate marker of IFN-I activity based on our cross-sectional analysis, longitudinal studies are needed to assess the utility of this marker in monitoring changes in serum IFN-I levels over time.
In particular, much of the existing literature involves cross-sectional research designs; longitudinal studies are needed.
