1. Department of Family and Community Medicine, Hospital Clínico Universitario de Sant Joan d’Alacant, Alicante, Spain.
2. Department of Anesthesiology and Reanimation, Hospital Clínico Universitario de Sant Joan d’Alacant, Alicante, Spain.
3. Department of Pain Medicine, The University of Texas MD Anderson Texas Center, Houston, Texas, USA.
4. McGovern Medical School, The University of Texas Health Science Center at Houston (UTHealth), Houston, Texas, USA.