Sick Sinus Syndrome: A Review - American Family Physician http://www.aafp.org/afp/2013/0515/p691.html http://www.aafp.org/afp/2013/0515/p691.html http://www.aafp.org/afp/2013/0515/p691.html Sick Sinus Syndrome: A Review - American Family Physician http://www.aafp.org/afp/2013/0515/p691.html https://www.aafp.org/afp/2013/0515/p691.html www.aafp.org [aafp.org]