“…However, these patients undergo between 8 and 20 bone marrow aspirations (BMA) and lumbar punctures (LP) within a one to 3-year treatment period. These procedures have been shown to be highly distressing to patients (Jay, Ozolins, Elliott, & Caldwell, 1983;Katz, Kellerman, & Seigel, 1980), and they affect patients' parents (see Boyer & Barakat, 1996;Jay & Elliott, 1990) and professional staff as well (Kazak, Blackall, Boyer, et al, 1996). Intrusive memories of BOYER / 105 their child's LPs and BMAs contribute to severe posttraumatic stress symptoms in 10.1% to 39.7% of mothers and 7% to 33.3% of fathers of childhood leukemia survivors (Barakat, Kazak, Meadows, et al, 1997;Stuber, Christakis, Houskamp, & Kazak, 1996).…”