Comments on the Letter to the Editor of Jie Weng et al. concerning “Relationship between preoperative serum rapid turnover proteins and early-stage surgical wound infection after spine surgery” by D. Kudo et al. (Eur Spine J; 2016: doi:10.1007/s00586-016-4855-z) as well as the Reply of D. Kudo et al. (Eur Spine J; 2018: doi:10.1007/s00586-018-5560-x)