DOI: 10.1055/s-00025476

Endoscopy International Open

References

Gerbershagen HJ, Rothaug J, Kalkman CJ. et al.
Determination of moderate-to-severe postoperative pain on the numeric rating scale: a cut-off point analysis applying four different methods.

Br J Anaesth 2011;
107: 619-626

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