Several studies found no association between the severity of baseline substance use and later mental distress.
Several studies found that 1 in 10 former recipients had been evicted or become homeless.
An analysis of several studies found that LDL cholesterol was 1.7percentt higher in smokers, but two smoking cessation studies found little or no difference.
Several studies found an increase in brain activity (as measured indirectly by blood flow) in the VLPFC of depressed patients.
Several studies found differences between patients' and physicians' perceptions of preferences (e.g., [2 5]).
However, several studies found no additional clinical benefit where lowering temperature below 34 °C.
Several studies found similar numbers of lymph nodes obtained during laparoscopic and laparotomic staging [11, 21].
For instance, several studies found weak correlation between test scores of students and consequent labor market outcomes.
Several studies found that daily doses ranging from 25 150 mg usually are effective [3, 9, 11, 13, 31].
Several studies found an increased rate of intubation in hypercapnic patients as compared to non-hypercapnic patients [6, 14].
Several studies found that migraine is associated to several vascular disorders, such as stroke or ischemic heart diseases [33].
