“…However, the results have been mixed. For example, some researchers have found travel nurses to positively impact patient outcomes (e.g., Bolton et al, 2007), whereas others found travel nurses to negatively impact patient outcomes (e.g., Bartel et al, 2014) and still others found travel nurses have no significant impact on patient outcomes (e.g., Alvarez et al, 2011) relative to permanent employees. In addition, different methods, samples, research designs, and controls have been used.…”