Abdul-Razzak, Khalid K., and Mohammad J. Alkhatatbeh. 2021. “Nightmares and Bad Dreams Among Individuals With Musculoskeletal Pain: A Link to Vitamin D and Calcium”. Research in Psychotherapy: Psychopathology, Process and Outcome 24 (2). https://doi.org/10.4081/ripppo.2021.533.