Reg Anesth Pain Med. 2001 Jan-Feb; 26(1):17-23.

[Reg Anesth Pain Med. 2001]

Anaesthesia. 1980 Sep; 35(9):854-7.

[Anaesthesia. 1980]

Anaesth Intensive Care. 1997 Oct; 25(5):585-6.

[Anaesth Intensive Care. 1997]

Expert Rev Med Devices. 2006 Jul; 3(4):499-508.

[Expert Rev Med Devices. 2006]

Reg Anesth Pain Med. 1998 Jul-Aug; 23(4):363-9; discussion 384-7.

[Reg Anesth Pain Med. 1998]