RPL	recurrent pregnancy loss
β2GPI	β2-glycoprotein I
HLA	human leukocyte antigen
APS	antiphospholipid syndrome
CE	chronic endometritis
RIF	recurrent implantation failure
rRNA	ribosomal RNA
IVF-ET	in vitro fertilization and embryo transfer
NLDM	non-Lactobacillus-dominant microbiome
PS	protein S
PC	protein C
FXII	coagulation factor XII
PCR	polymerase chain reaction
BV	bacterial vaginosis
LDA	low-dose aspirin
UFH	unfractionated heparin
RCT	randomized controlled trial