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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