Similarities and differences between the cough suppression test and the cough challenge test.

"The authors declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article."

"Funding: The authors disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This study was supported by the National Natural Science Foundation of China (No. 82070102 and 82270114); the Project of Science and Technology Commission of Shanghai Municipality (No. 21Y11901400 and 20ZR1451500); the Programme of Shanghai Academic Research Leader (No. 22XD1422700), the Fund of Shanghai Youth Talent Support Programme, the Fund of Shanghai Municipal Health Commission for Excellent Young Scholars (No. 2018YQ01) and the Shanghai Sailing Programme (No. 19YF1444100)."