Table 1.

MEDLINE search strategy

1) (h?emodialy$ or h?emo$filtrat$ or ultrafiltrat$).tw

2) exp Renal Dialysis/or exp Hemofiltration/ or exp Hemodiafiltration/or exp Ultrafiltration

3) 1 or 2

4) (pain$ or dolo?r or hurt$ or ache or aching or pang? or $algia or $dynia or discomfort or nocicept$ or analge$ or an?esthe$ or pain?kill$ or antihyperalg$ or algesi$ or anguish$ or suffer$).tw

5) exp Pain/or exp Nociception/or exp Analgesia/ or exp Anesthesia/or exp Anesthetics/or exp Analgesics/or exp Stress, Psychological/ or exp Stress, Physiological/

6) 4 or 5

7) 3 and 6