[1] MHAT Queen Joanna, Sofia, Bulgaria
[2] Oncologcal Inst I Chiricuta, Cluj Napoca, Romania
[3] Natl Oncol Ctr, BU-1157 Sofia, Bulgaria
[4] MHAT St Marina, Varna, Bulgaria
[5] Reg Oncol Dispensary Plovdiv, Plovdiv, Bulgaria
[6] St Joseph Mercy Canc Care Ctr, Ann Arbor, MI USA
[7] AstraZeneca, Loughborough, Leics, England
[8] AstraZeneca, Macclesfield, Cheshire, England
[9] Sarah Cannon Res Inst, Nashville, TN USA