Device- and nondevice-guided slow breathing to reduce blood pressure in patients with hypertension: protocol for a systematic review and meta-analysis - Gonçalves, Kamila Shelry de Freitas; Daniel, Ana Carolina Queiroz Godoy; Lamas, José Luiz Tatagiba; Oliveira, Henrique Ceretta; Silveira, Renata Cristina de Campos Pereira; Cloutier, Lyne; Veiga, Eugenia Velludo (JMIR Research Protocols, 2022)