Effectiveness of mindfulness-based online therapy or internet-delivered cognitive behavioral therapy compared with treatment as usual among patients with persistent somatic symptoms: Protocol for a randomized controlled trial - Velina Vangelova-Korpinen; Helena Liira; Samu N. Kurki; Markku Sainio; Antti Malmivaara; Mari Kanerva; Jan-Henry Stenberg; Mikko Varonen; Mikko Venäläinen; Piia Vuorela; Jari Arokoski (PLoS ONE, 2025)