Because our data included patients with traumatic intracranial hemorrhage, we did enroll patients with complicated mild TBI.
Because our data includes only twins reared together, it does not allow modeling of genetic dominance and common environmental effects simultaneously, i.e. these effects are confounded.
Because our data included repeated measures of HRV for many participants, our data may lack independence.
The external validity of these findings must be confirmed by other studies because our data included a very specific group of subjects.
Finally, because our data included relatively few people in a LAT relationship, especially in Eastern European countries, we are cautious about drawing definite conclusions about the differences between Eastern and Western Europe and about the different types of LAT union.
Because our data set included 42.4% of all breast cancer cases under 65 years diagnosed during the study period, the results represents this population much better than the population of older women.
Because our data set includes isolates that are separated by varying amounts of evolution (within the farm clone; between the farm clone and other S. Typhimurium 135@; and between more diverse S. Typhimurium), we examined whether the dN/dS rate varied between branches associated with these different evolutionary scales.
Second, we cannot readily separate the effect of technical assistance from funding on pandemic preparedness scores because our funding data includes a large component of technical assistance, namely, staff salaries.
Secondly, we could not definitively confirm the appropriate use of limited resection, because our data did not include survival data.
Because our data did not include individual level information on socioeconomic status such as education, occupation, or income, we used median zip code income from 2000 US census data to infer patients' socioeconomic status.
