Demonstrate that a 4-day training session will allow nurses to master basic hypnoanalgesia techniques, and this new tool will translate into a reduction of procedural distress and pain in their patients, thereby opening the way to larger clinical trials in various pediatric settings.

Inclusion Criteria:

• children followed in the hematology-oncology outpatient clinic at least 4 times per year
• good understanding in French
• use of topic anesthesia or distraction object allowed, as long as used at all venipuncture measured sessions

Exclusion Criteria:

• prior use of hypnoanalgesia
• patients coming for emergency or non-scheduled appointment
• patients with acute pain on their scheduled appointment to the clinic
• acute psychiatric disease