Received: 8 October 2018
Accepted: 6 August 2019
First Online: 17 August 2019
Ethics approval and consent to participate
: Before patient data collection, we applied for the appropriate ethics approval and obtained it from the Institutional Review Board (IRB) of Chang Gung Memorial Hospital (IRB No.: 201601450B0). Although all patients receiving chemotherapy are required to provide complete informed consent before undergoing adjuvant, neoadjuvant, or palliative chemotherapy in clinical practice, the IRB exempted us from the informed consent for patients’ participation because our study design was retrospective.
: Not applicable.
: The authors declare that they have no competing interests.