Here is the design of a clinical trial:

Official Title: Transcranial Electrical and Acoustic Stimulation for Tinnitus: A Randomized Double Blind Clinical Trial

Included conditions:
- Tinnitus
- Tinnitus, Subjective

Study Armgroups:
- {'label': 'Study Intervention(s) A', 'type': 'EXPERIMENTAL', 'description': 'TRNS bilateral temporal regions combined with AS for 20 minutes\n\nSham-tRNS bilateral temporal regions combined with Sham-AS for 20 minutes', 'interventionNames': ['Other: transcranial Random Noise Stimulation (tRNS) with acoustic stimulation (AS)']}
- {'label': 'Study Intervention(s) B = Control Intervention', 'type': 'EXPERIMENTAL', 'description': 'TRNS bilateral temporal regions for 20 minutes\n\nSham-tRNS bilateral temporal regions for 20 minutes', 'interventionNames': ['Other: transcranial Random Noise Stimulation (tRNS) without acoustic stimulation (AS)']}

Interventions:
- {'type': 'OTHER', 'name': 'transcranial Random Noise Stimulation (tRNS) with acoustic stimulation (AS)', 'description': 'The study intervention consists of a bilateral tRNS application over temporal regions, parallel to the application of AS with WN 15 dB above the individual MML in one study arm. TRNS will be applied using two electrodes (35 qcm, 0,9% saline -soaked). Stimulus intensity will be below individual sensation threshold, but max. 2 mA. AS will never surpass 85 dB SPL at the ears.', 'armGroupLabels': ['Study Intervention(s) A']}
- {'type': 'OTHER', 'name': 'transcranial Random Noise Stimulation (tRNS) without acoustic stimulation (AS)', 'description': 'The study intervention consists of a bilateral tRNS application over temporal regions', 'armGroupLabels': ['Study Intervention(s) B = Control Intervention']}

Primary Outcomes:
- {'measure': 'Change of self-report Visual Analogue Scale (VAS) ratings on tinnitus severity (loudness, distress)', 'description': 'Minmum value = 1, maximum value =10. The higher scores means a worse outcome.', 'timeFrame': 'up to 6 months'}
- {'measure': 'Change of minimum masking level (MML)', 'timeFrame': 'up to 6 months'}

Please estimate the sample size based on the assumption: 
significance level (alpha) = 0.05, power (beta) = 0.95, groups = 2, measurements = 5, dropout rate = 25%
Sample size {14}
        Sample size calculations were conducted in G*Power 3.1.9 for the repeated measures, within-between interaction (ANOVA). The total sample size needed to detect a high assessment-by-treatment interaction effect (fâ=â0.25, betaâ=â0.95, alphaâ=â.05, groupsâ=â2, measurementsâ=â5) is 32 participants. However, to compensate for a high estimated dropout rate of up to 25% during treatment, the aim is to recruit 40 participants leading to 20 participants per group.