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

• José Luís Martins,
• Jesus Viana,
• José Santos

Affiliations

José Luís Martins

Corresponding author.; Department of Cardiology, Baixo Vouga Hospital Centre, Aveiro, Portugal

Jesus Viana

Department of Cardiology, Baixo Vouga Hospital Centre, Aveiro, Portugal

José Santos

Department of Cardiology, Baixo Vouga Hospital Centre, Aveiro, Portugal