Here is the design of a clinical trial:

Official Title: Development and Evaluation of a Novel Mindful-Compassion Art Therapy (MCAT) Supervision for Self-Care and Collegial Support Among End-of-Life Care Professionals in Singapore

Included conditions:
- End-of-life Care

Study Armgroups:
- {'label': 'MCAT Supervision Group', 'type': 'EXPERIMENTAL', 'description': 'The 6-week 3-hour Mindful-Compassion Art Therapy (MCAT) supervision will include intervention elements of brief psycho-education, weekly mindfulness mediation that serve as a foundation to foster creative art making, reflective writing, group sharing and discussion.', 'interventionNames': ['Behavioral: Mindful-Compassion Art Therapy Supervision']}
- {'label': 'Waitlist Control Group', 'type': 'EXPERIMENTAL', 'description': 'Those assigned to the waitlist control group will not receive Mindful-Compassion Art Therapy (MCAT) supervision until approximately 1.5 month later; equivalent intervention and assessment procedures will be administered.', 'interventionNames': ['Behavioral: Mindful-Compassion Art Therapy Supervision']}

Interventions:
- {'type': 'BEHAVIORAL', 'name': 'Mindful-Compassion Art Therapy Supervision', 'description': 'Each "Mindful-Compassion Art Therapy Supervision" group will focus on 3 major areas that cultivate self-care, resilience and communal support. The specific structure include: (1) Self-care and Stress Management in Week 1 and 2 (i.e., concept of mindfulness and art, the symbol of the mandala and its use in self-care, mindfulness practice and art); (2) Sharing of Clinical Expertise and Experiences in Week 3 and 4 (i.e., Create mindful art about one meaningful and one challenging patient/client interaction with small group discussion); and (3) Understanding Grief and Meaning-Making in Week 5 and 6 (i.e., Create mindful art representing a clinical encounter of mortality, and meaning-making from reflection on grief).', 'armGroupLabels': ['MCAT Supervision Group', 'Waitlist Control Group']}

Primary Outcomes:
- {'measure': "Change from Baseline 'Maslach Burnout Inventory- General Survey (MBI-GS)' at immediate after intervention [T2] and 4 weeks follow-up [T3].", 'description': 'This tool measures changes in level of burnout.', 'timeFrame': 'It will be assessed at baseline [T1], immediately after intervention [T2], and four weeks post intervention [T3].'}

Please estimate the sample size based on the assumption: 
15% attrition rate, 80% power, 5% significance level, two-tailed test
Sample size calculation
        Given an attrition rate of 15% at follow-ups, a sample of 60 (N = 60) will provide 80% power to detect an effect size of 0.8 (referencing highly effective psychotherapy studies) [31] on the primary outcome measure of the Maslach Burnout InventoryâGeneral Survey (MBI-GS) [4] between the intervention and control groups at a (two-tailed test) 5% level of significance.