“…Finally, we have limited data on what motivates NHVs to participate in phase 1 trials. In the United States and elsewhere, money appears to be a significant motivating factor for some research participation, and the less well-off may be more motivated than others to participate in phase 1 trials (Hassar et al, 1977; Novak, Seckman, & Steward, 1977; Robertson, 1986; Bigorra and Banos, 1990; Dooley, 1991; McNeil, 1993, 176; Tishler and Bartholomae, 2002; Tishler and Bartholomae, 2003). For example, Kirkpatrick found that “money is the primary reason young [mean age 28] and elderly [mean age 72] volunteers participate in their first drug study and the primary reason young volunteers participate in subsequent studies” (1991, 109).…”