Finkelstein EA, Mansfield C, Wood D, Rowe B, Chay J, Ozdemir S. Trade-offs between civil liberties and national security: a discrete choice experiment. Contemp Econ Policy. 2017 Apr;35(2):292-311. doi: 10.1111/coep.12188
Espaulella J, Guyer H, Diaz-Escriu F, Mellado-Navas JA, Castells M, Pladevall-Vila M. Nutritional supplementation of elderly hip fracture patients. A randomized, double-blind, placebo-controlled trial. Age Ageing. 2000 Sep;29(5):425-31.