Cook SF, Lanza L, Zhou X, Sweeney CT, Goss D, Hollis K, Mangel AW, Fehnel SE. Gastrointestinal side effects in chronic opioid users: results from a population-based survey. Aliment Pharmacol Ther. 2008 Jun 15;27(12):1224-32.
Svanes C, Dharmage S, Sunyer J, Zock JP, Norback D, Wjst M, Henrich J, Jarvis D, de Marco R, Plana E. Long-term reliability in reporting of childhood pets by adults interviewed twice, 9 years apart. Results from the European community respiratory health survey I and II. Indoor Air. 2008 Apr;18(2):84-92.
Harshman RS, Richerson GT, Hadker N, Greene BL, Brown TM, Foster TS. Impact of a hypertension management/health promotion program on commercial driver's license employees of a self-insured utility company. J Occup Environ Med. 2008 Mar 1;50(3):359-65.