Consider the following tree diagram: 
Which of the following nodes are parent nodes?
Definitions:
Treatment Plan
A comprehensive outline designed by healthcare professionals detailing the strategies and interventions for managing a patient's specific health condition or psychological issue.
Research Method
Systematic procedures or strategies used to investigate a hypothesis, gather data, and analyze results in scientific studies.
Longitudinal Study
A study that observes the same participants on many occasions over a long period of time.
Nomothetic
An approach focusing on establishing general laws and principles through experiments and studies, applicable to the wider population.
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