Author contributions
RECRUITMENT
QX, XL, XDL, YZ, DS, YG, and LZ designed the clinical trial and the documents used in this trial. QC and HL organized the recruitment and visits of participants at the trial site. XL, XDL, TY, DS, JJL, PX, JS and MX monitored the progress of the trial. YS cleaned and analyzed the data. JL detected serum neutralizing antibodies and anti-PF4/H antibodies. QX, XL, and YZ drafted the manuscript. LZ and YG reviewed the manuscript. All authors contributed to the interpretation of the data and the critical review of the manuscript.