Dear professors
I am Ming Chen, the author of this study “Low expression of CHRDL1 and SPARCL1 predicts poor prognosis of lung adenocarcinoma based on comprehensive analysis and immunohistochemical validation” (CCIN-D-21-00431). Recently, thank you for your help, I have known the publication of my study. But I meet a problem with the invoice for this study, and I remember that I chose a credit card to pay the APC fee and I failed to receive the invoice. Now, my hospital asks me for the invoice unless my hospital cannot provide reimbursement for me. I am not very familiar with your system, and I am very worried about this. I would appreciate it if you can give me the invoice for this study. If you have any queries please communicate with me without hesitation. My email is chenming@zjcc.org.cn. Looking forward to your positive response. Thank you very much for what you do for us! Best wishes to you.
Yours sincerely
Ming Chen