Wardman M, Chintakayala PK, de Jong G. Values of travel time in Europe: review and meta-analysis. Transp Res Part A Policy Pract. 2016 Dec;94:93-111. doi: 10.1016/j.tra.2016.08.019
Pariser D, Schenkel B, Carter C, Farahi K, Brown TM, Ellis CN. A multicenter, non-interventional study to evaluate patient-reported experiences of living with psoriasis. J Dermatolog Trea. 2016 Jan;27(1):19-26. doi: 10.3109/09546634.2015.1044492