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Simplified illustration of the decision trees. A square node represents the decision node. A circular node represents a chance node. Branches from a chance node represent possible outcomes. An M○ node represents a Markov node. QFT, QuantiFERON®-TB Gold In-Tube; TB, tuberculosis; T-SPOT, T-SPOT®.TB; TST, tuberculin skin test; CXR, chest X-ray examination; INH, 9-month INH chemoprophylaxis protocol for latent tuberculosis infection.
