A Web-Based Mindfulness-Based Cognitive Therapy for Couples Dealing With Chronic Cancer-Related Fatigue: Protocol for a Single-Arm Pilot Trial - Fabiola Müller; Sophie van Dongen; Rosalie van Woezik; Marijke Tibosch; Marrit A Tuinman; Melanie P J Schellekens; Jean-Philippe Laurenceau; Marije van der Lee; Mariët Hagedoorn (JMIR Research Protocols, 2023)