ATE	Average treatment effect
OHC	online health community
$\mathrm{SCGini}$	the specialty category’s Gini coefficient
O2O	online-to-offline
SP	served patients
OR	online reviews
$NDA$	the mean of the number of Doctors’ articles
$BVS$	the breadth of the voted specialties
$DRR$	the ratings in user reviews of the doctors
$DOC$	the contribution score for the doctors
CTM	Chinese traditional medicine
PSM	propensity score matching