[1] The Cleveland Clinic Foundation,
[2] 9500 Euclid Avenue,undefined
[3] Cleveland,undefined
[4] OH 44195,undefined
[5] USA,undefined
[6] M.D. Anderson Cancer Center,undefined
[7] The University of Texas,undefined
[8] Department of Symptom Control & Palliative Care,undefined
[9] 1515 Holcombe Boulevard,undefined
[10] Box 8,undefined
[11] Houston,undefined
[12] Texas 77030,undefined
[13] USA e-mail: dzhukovs@mdanderson.org Tel.: 713-792-3937 Fax: 713-792-6092,undefined