The Temperature measurement page has been updated with additional information about the accuracy of peripheral temperature measurement.
Niven, DJ, Gaudet, JE, Laupland, KB, et al. Accuracy of Peripheral Thermometers for Estimating Temperature. A Systematic Review and Meta-analysis. Annals of Internal Medicine 2015;163(10):768-77. http://dx.doi.org/10.7326/M15-1150.