ABSTRACT
The increase of genetic knowledge as well as advances in prenatal echocardiography offer more tools for counseling, but require precise information. Among the large amount of knowledge, the textbook by Nora et al 1 on cardiovascular disease is still an excellent comprehensive monograph about the subject. Owing to rapidly increasing genetic knowledge, current online information providing details about all aspects of certain conditions is essential. The most important genetic database including relevant references is Online Mendelian Inheritance in Man (https:// www.ncbi.nlm.nih.gov/Omim/searchomim.html), 2 based on Victor McKusick ’ s classical catalogs.
