Although Barzun's influence on literary studies is difficult to assess, there's little doubt about his role in the revival of Hector Berlioz.
The survey also indicates that a comparison of different efficiency improvement studies is difficult because their results are not readily commensurable.
Therefore, the broad applicability of laboratory results to diverse clinical conditions is uncertain and the comparison of effects across studies is difficult.
Although these test methods can give an indication of the mechanisms involved in sulfate attack, prediction of field performance using lab studies is difficult.
Given that patients often apply the cream themselves at home, further dosing variability is expected and, consequently, accurate comparison of the results of different published studies is difficult.
Thus, comparing across available studies is difficult.
Thus a direct comparison of the different studies is difficult.
However, carrying out relevant in vivo studies is difficult to reconcile with animal welfare concerns and may be extremely costly.
As the present study analyses the difference between coregistered and original data, a comparison of both studies is difficult.
However, the identification of causal pathways in these studies is difficult and involves statistical assumptions about unobserved heterogeneity that are difficult to test.
The comparison of the present results with previous studies is difficult because, to our knowledge, no study has evaluated BFMI and FFMI in young athletes during growth.
