Table S1. Newcastle-Ottawa Scale (NOS) scoring system to asses risk of bias for the studies included.

Study name	Representatives of the exposed cohort	Selection of the non-exposed cohort	Ascertainment of exposure	Outcome of interest Was not present at start of study	Comparability of cohorts on the bases of the design or analysis	Assessment of outcome	Was follow-up long enough for outcome to occur	Adequacy of follow-up	Total quality score (out of 9)
Discontinuation of HeartWare RVAD support without device removal in chronic BIVAD patients	1	0	1	1	0	1	1	1	6
Surgical Considerations and Challenges for Bilateral Continuous-Flow Durable Device Implantation	0	0	1	1	0	1	1	1	5
Long-term biventricular HeartWare ventricular assist device support—Case series of right atrial and right ventricular implantation outcomes	1	0	1	1	0	1	1	1	6
Durable Biventricular Support Using Right Atrial Placement of the HeartWare HVAD	1	0	1	1	0	1	1	1	6
Liver failure in total artificial heart therapy	1	0	1	1	0	1	0	0	4
CardioWest total artificial heart: Bad Oeynhausen experience	1	0	1	1	0	1	1	1	6
Survival after biventricular mechanical circulatory support: Does the type of device matter?	1	0	1	1	0	1	1	1	6
CardioWest (Jarvik) total artificial heart: a single-center experience with 42 patients	1	0	1	1	0	1	1	1	6
Bridge to transplantation with the Jarvik-7 (CardioWest) total artificial heart: a single-center 15-year experience	1	0	1	1	0	1	1	1	6
Experience with the SynCardia total artificial heart in a Canadian centre	1	0	1	1	0	1	1	1	6
Experience with more than 100 total artificial heart implants	1	0	1	1	0	1	1	1	6
Clinical indications for implantation of the total artificial heart	1	0	1	1	0	1	1	1	6