No such model for c-fos exists to compare to, since c-fos is not expressed within trigeminal ganglion cells [5].
Few to no data exist to compare conventional venography to CT venography for the evaluation of the IVC in the setting of trauma, therefore each case should be considered individually on the basis of the patient's clinical presentation.
Stream restoration efforts in the United States are increasingly aimed towards water quality improvement, yet little process-based guidance exists to compare pollutant removals from different restoration techniques for variable site conditions.
Limited data exist to compare CRT-D with CRT-P.
A true need exists to compare this mercury substitute thermometer with the mercury device.
Additionally, efforts exist to compare and assess the performance of multilateral agencies, such as the Multilateral Organizational Performance Assessment Network MOPANN).
Currently, no head-to-head trial data exist to compare pemetrexed to an intervention other than docetaxel.
However, no trials exist to compare these various modified FOLFIRINOX schedules to GEM alone, creating some uncertainty about the efficacy and toxicity of the modified schedules.
Although no prospective, randomised trial exists to compare surgery versus radiotherapy in the treatment of early-stage NSCLC, surgical resection has traditionally been considered the treatment of choice.
Further, no additional data exist to compare the conditions on infection control and other measures taken within the two analyzed phases of the epidemic, making definite interpretation impossible.
