It is important to note that the number of nodes recovered may reflect a more extensive dissection, comprehensiveness of pathological evaluation, variations in number of nodes of each patient, and difficulties in performing lymphadenectomies due to medical comorbidities (Yasunaga et al, 2003).
In other cases, the evaluation uses the variations in the exposition to a certain policy that originate from an exogenous source that is not correlated to the outcome of interest (instrumental variables or natural experiment approach).
The methodological approach for the evaluation of spatial variations in the available energy potential was based on the combination of existing methods adapted to the local scale and data availability.
This information provides a complete overview of the role of Spn19A for pneumococcal disease facilitating the decision process for those countries considering to introduce PCV, but also will allow evaluation of potential variations in the prevalence of Spn19A and other serotypes, as reported previously in studies following introduction of PCV7 [ 14- 19, 23].
The influence of fineness of aluminium powder through an evaluation of variation in the workability of the mix, rate of aeration and fresh density with time, dry density, compressive strength and water absorption of aerated cement paste and mortar were studied.
Neither of these studies reported on evaluation of variation in the association between CLL and radiotherapy treatment with time since treatment.
The cats showed a different age (2 months-18 years), allowing an evaluation of age-dependent variations in the storage of the elements.
Indeed, this is particularly important for a better evaluation of the possible variations in the CI taking place as a consequence of pretreatments, when the hemicellulose and lignin fractions vary significantly.
Preoperative evaluation and awareness of anatomical variations in the pulmonary vessel is essential for a secure pulmonary resection.
