Fundamental issues on electromagnetic fields (EMF).

{
  "study_type": "review",
  "exposure": {
    "band": null,
    "source": null,
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [],
  "main_findings": "The paper discusses fundamental principles of electromagnetic field radiation, including physical characteristics of electric and magnetic fields, everyday sources, detection/measurement methods, instrument considerations, and issues/misconceptions about shielding and exposure reduction.",
  "effect_direction": "unclear",
  "limitations": [
    "No specific study design, population, exposure parameters, or health outcomes are described in the abstract.",
    "Appears to be a general discussion/educational overview rather than original empirical research (based on abstract)."
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "electromagnetic fields",
    "electric fields",
    "magnetic fields",
    "sources",
    "measurement",
    "detection",
    "instruments",
    "shielding",
    "exposure reduction"
  ],
  "suggested_hubs": []
}