Belzarena 1994.

Methods	Study design: parallel‐group randomized controlled trial Sample size: unknown Country: unknown Setting: unknown Dates conducted: unknown Postoperative opioid used and delivery: unknown Pain score collection: unknown Concurrent postoperative analgesics: unknown
Participants	Inclusion criteria (unknown) Exclusion criteria (unknown)
Interventions	Group Preemptive (unknown) Group Post‐incision (unknown)
Outcomes	Unknown
Notes	Funding: unknown Declarations of interest: unknown Authors contacted: yes Other: no abstract available. Unable to obtain full text.