Effectiveness of a Social Cognitive Theory-based health education intervention on depression (SCODESS) among mothers of children with cancer in Klang Valley, Selangor, Malaysia—A quasi-experimental study - Wan Syahirah Wan Ghazali; Halimatus Sakdiah Minhat; Sherina Mohd Sidik; Iqmer Nashriq Mohd Nazan (PLoS ONE)