Find the interval of convergence of the series. 
Definitions:
Psychological Disturbances
Conditions affecting mental health, leading to deviations from expected thoughts, emotions, or behavior.
Early Sexual Experiences
Initial encounters with sexual activity or awareness, which can significantly influence an individual's sexual attitudes, behaviors, and well-being in later life.
Scientific Experiments
A methodological procedure carried out with the objective of verifying, refuting, or establishing the validity of a hypothesis.
Natural Settings
Environments or conditions that are not artificially manipulated or controlled, often used in observational studies.
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