Edwards PET, Parsons GR, Myers KH. The economic value of viewing migratory shorebirds on the Delaware Bay: an application of the single-site travel cost model using on-site data. Hum Dimens Wildl. 2011;16(6):435-44. doi: 10.1080/10871209.2011.608180
Rothman KJ. BMI-related errors in the measurement of obesity. Int J Obes. 2008 Aug 1;32 Suppl 3:S56-9.
Britt (DiBenedetti) DM, Collins FL, Cohen LM. Cigarette smoking and chewing gum use among college students. J Appl Biobehav Res. 2007 Jun 4;4(2):85-90. doi: 10.1111/j.1751-9861.1999.tb00057.x
Kjeldsen BJ, Thorsen H, Whalley D, Kronborg O. Influence of follow-up on health-related quality of life after radical surgery for colorectal cancer. Scand J Gastroenterol. 1999 May;34(5):509-15.
Sorensen HT, Sabroe S, Gillman M, Rothman KJ, Madsen KM, Fischer P. Continued increase in prevalence of obesity in young Danish men. Int J Obes. 1997 Aug;21(8):712-4.