Reference (Author, ref #)	Important	Very important	One sentence explanation
Yarnitksy et al., 2019, [17]	X		Trial which shows remote electrical neurostimulation can treat migraine attacks
Tepper et al., 2023, [20]	X		Trial which establishes that remote electrical neurostimulation is effective for migraine prevention
Peretz et al. 2023 [23]		XX	Retrospective study of 140 patients which did not show increased teratogenicity of REN when used in pregnancy
Vaidya et al. 2018 [25]	X		An RCT for the use of TENS device for pregnancy-related pelvic pain in 30 patients did not reveal any negative impact during pregnancy
Tassorelli et al., 2018, #23	X		Study which showed non-invasive vagal nerve stimulation can be used as abortive treatment of migraine
Diener et al., 2019, #24	X		Trial which establishes that non-invasive vagal nerve stimulation is effective for prevention of episodic migraine
Ding et al. 2021 [48]		XX	Review of invasive VNS use in 44 pregnant patients
Sabers et al. [49]		XX	Review of invasive VNS for use in 21 pregnant patients
Dodick et al. [55]	X		A safety review of sTMS in for the management of headache
Starling et al. 2018, #15	X		Pivotal study establishes TMS is effective for migraine prevention
Lipton et al., 2010, #2	X		Study which establishes TMS as an effective acute treatment of migraine
Eryilmaz et al. 2015 [57]		XX	Case control study of rTMS in pregnancy showing that rTMS is not associated with poorer cognitive or motor development outcomes in children aged 18–62 months
Chou et al., 2019, #9	X		Trial which shows that external trigeminal neurostimulation is effective in acute migraine treatment
Schoenen et al., 2013, #10	X		Study which establishes external supra-orbital stimulation's efficacy in migraine prevention
Trevizol et al. 2015 [69]			Case of e-TNS used for the management of major depressive disease in a pregnant patient
Daniel et al., 2022, #38	X		Trial which shows external concurrent occipital and trigeminal nerve stimulation is effective for abortive treatment of migraine
De Coo et al. 2016 [73]		XX	Case of invasive occipital nerve stimulation for cluster headache in a pregnant patient
Miller et al. 2017 [72]		XX	Case of invasive occipital nerve stimulation for hemicrania continua in a pregnant patient