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Table 5 Referrals to physician specialties over 2006-2011

From: Referral paths in the U.S. physician network

(a) Top 5 specialties.
Cardiovascular disease
Internal medicine
Family practice
Interventional cardiology
Pulmonary disease
(b) Top 5 cross-specialty referrals.
Internal medicine → cardiovascular disease
Cardiovascular disease → internal medicine
Family practice → cardiovascular disease
Cardiovascular disease → family practice
Internal medicine → family practice