Here is the design of a clinical trial:

Official Title: A Randomized Trial Comparing the Live Birth Rate of Immediate Versus Delayed Frozen Embryo Transfer (FET) Replacing a Single Blastocyst in the First FET of the First Stimulated IVF Cycle Following a Freeze-all Strategy

Included conditions:
- IVF
- Frozen Embryo Transfer

Study Armgroups:
- {'label': 'Immediate FET group', 'type': 'OTHER', 'description': 'FET will be performed in the first menstrual cycle following the stimulated IVF cycle', 'interventionNames': ['Procedure: Immediate FET']}
- {'label': 'Delayed FET group', 'type': 'OTHER', 'description': 'FET will be performed in the second menstrual cycle following the stimulated IVF cycle', 'interventionNames': ['Procedure: Delayed FET']}

Interventions:
- {'type': 'PROCEDURE', 'name': 'Immediate FET', 'description': 'FET is performed in the first menstrual cycle following the stimulated IVF cycle', 'armGroupLabels': ['Immediate FET group']}
- {'type': 'PROCEDURE', 'name': 'Delayed FET', 'description': 'FET is performed in the second menstrual cycle following the stimulated IVF cycle', 'armGroupLabels': ['Delayed FET group']}

Primary Outcomes:
- {'measure': 'live birth', 'description': 'deliveries ≥22 weeks gestation with heartbeat and breath', 'timeFrame': '1 year after FET'}

Please estimate the sample size based on the assumption: 
Significance level (α) = 0.05, Power (β) = 0.80, Dropout rate = 10%
Sample size calculations and statistical analysis
        
          Sample size estimation
          According to our previous study, the live birth rates in the delayed and immediate FET groups were 37% and 47%, respectively, per transfer, representing a 10% difference between the two groups.19 The calculated sample size was 376âwomen in each group (Î±=0.05âand Î²=0.80). Allowing for 10% drop-out, 828 participants or 414 participants in each arm will be needed.