1 Department of Oncology, Liaocheng People's Hospital, Affiliated to Shandong University and Clinical School of Shandong First Medical University, Liaocheng 252000, PR China.
2 Department of Oncology, Liaocheng People's Hospital, Affiliated to Shandong University and Clinical School of Shandong First Medical University, Liaocheng 252000, PR China. Electronic address: gracejasson@yeah.net.
3 Department of Geriatrics, Liaocheng People's Hospital, Affiliated to Shandong University and Clinical School of Shandong First Medical University, Liaocheng 252000, PR China.