The heterogeneity and the methodological quality of the studies published preclude of more robust conclusions.
Use of skin adhesives may be precluded because of the presence of persistent moisture and saliva.
The nature of some of these comparisons precluded blinding of patients and caregivers.
Insecurity precluded assessment of ten of the pre-selected clusters.
The limited follow up of this group precluded assessment of survival in relation to ploidy.
The cross-sectional nature of the study precluded assessment of HIV status disclosure dynamics over time.
The use of these diverse strategies of recruitment precluded the calculation of an exact response rate.
For this reason Apple precluded use of GPS on iOS 4 location backgrounding.
But inequalities in blood pressure, favouring amlodipine, throughout the multiyear trial precluded comparison of outcomes.
However, for many years Food and Drug Administration guidelines specifically precluded participation of females in many drug studies.
