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Assessment of the face validity of two pain scales in Kenya: a validation study using cognitive interviewing

Kristin TL Huang, Claudio Owino, Rachel C Vreeman, Mildred Hagembe, Festus Njuguna, R Matthew Strother and Gregory P Gramelspacher*

BMC Palliative Care 2012, 11:5  doi:10.1186/1472-684X-11-5

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