Contactless Breathing Monitoring at Home and in the Hospital: Protocol for a Low-Cost Frequency-Modulated Continuous-Wave Radar-Based Device - Arnav Hari; Ravishankar Kumar; Brijesh Kumbhani; Sam Darshi; Satyam Agarwal; Jyotindra Singh Sahambi; Suksham Jain; Deepak Chawla (JMIR Research Protocols)