Do they just look like spikes or are they actual spikes?

Bibliographic Details
Main Authors: José Luís Martins, Jesus Viana, José Santos
Format: Article
Language:English
Published: Elsevier 2018-12-01
Series:Revista Portuguesa de Cardiologia (English Edition)
Online Access:http://www.sciencedirect.com/science/article/pii/S2174204918304276