However, this association disappears after adjustments for years of study, which constitutes a direct indicator of socioeconomic levels.
The full list of contributors for this study, which constitute the HPMRS Breast Cancer Study Group, can be obtained at web appendix; http://www.hrms.com.my/hpmrs/page.jsp content=pHome.jsp content=pHome
Data for people who died before t0 does not exist in the study, which constitutes a case of left data truncation.
The dose reminder functions of the pillboxes are disabled for all participants for the first 3 months of the study, which constitutes a run-in period.
The results were consistent with those from the previous qualitative studies, which constituted the construct [ 23, 24].
The section "Case studies" focuses on numerical case studies which constitute a key part of our paper.
Three sub-basins, located in the middle and lower Dongjiang River basin, were selected as case studies, which constitute the most important water source system for Guangdong province and Hong Kong.
In honeybees, the existence of specialization in nectar or pollen collection has led to a series of studies which constitute the best studied case of how variations in behavioral responsiveness may result in task specialization [10].
Much research on fertilization and preimplantation development has involved in vitro studies, which constitutes a very artificial environment.
Cortical-surface-based functional magnetic resonance imaging retinotopy (Engel et al. 1994; Sereno et al. 1995; DeYoe et al. 1996) is now established and often combined with functional studies, which constitute the overwhelming majority of in vivo human neuroimaging experiments.
There were 9,212 cases of toxic exposures during the study period, which constituted 0.94% of total ED attendances.
