Long-term trials of pregabalin and duloxetine for fibromyalgia symptoms: How study designs can affect placebo factors

1Department of Medicine, McKnight Brain Institute, University of Florida, College of Medicine, Gainesville, FL 32610, USA 2Department of Oral Surgery, McKnight Brain Institute, University of Florida, Gainesville, FL 32610, USA *Corresponding author. Tel.: +1 352 273 5346; fax: +1 352 392 8483. E-mail: [email protected]