ARTs	Assisted reproductive technologies
CRL	Crown-rump length
EP	Ectopic pregnancy
GIFT	Gamete intrafallopian transfer
GRADE-CERQual	GRADE-CERQual Interactive Summary of Qualitative Findings
Hb	Hemoglobin
HP	Heterotopic pregnancy
IM	Intramuscular
IQR	Interquartile range
iSoQ	Interactive Summary of Qualitative Findings
IU	Intrauterine
IUD	Intrauterine device
IUP	Intrauterine pregnancy
IVF-ET	In vitro fertilization-embryo transfer
JBI	Joanna Briggs Institute
KCl	Potassium chloride
MTX	Methotrexate
NRSI	Non-randomized studies of interventions
PEP	Persistent ectopic pregnancy
PICO	Population/patients, intervention/exposure, control/comparison, and outcome
PID	Pelvic inflammatory disease
PRISMA	Preferred Reporting Items for Systematic Reviews and Meta-Analysis
PROSPERO	International Prospective Register of Systematic Reviews
PUL	Pregnancy of unknown location
SD	Standard deviation
TVUS	Transvaginal ultrasound
US	Ultrasound