<qa>  What is the goal of the test?The radiation exposure received by the operator during each blood sampling procedure will be measured using an Electronic Portable Dosimeter EPD worn on the chest of the operator. The data will be split into two using the known start and end times of each blood sampling procedure. The data will then be integrated over each time period to calculate the total radiation dose for each interval. This will create paired measurements of the same variable for each blood sampling event for each participant. The statistical significance of the percentage difference in the radiation exposures received by the operator during each blood sampling method will then be assessed using a Wilcoxon matched paired test with the null hypothesis that there is no difference between the measured radiation doses. The aim in this case is to show statistically that the null hypothesis of no difference in the mean radiation doses for the 2 techniques is untenable. 