Service of Ophthalmology, Centro Hospitalar Universitário de Santo António, Porto, Portugal

André Ferreira

Unit of Anatomy, Department of Biomedicine, Faculty of Medicine, University of Porto, Porto, Portugal

André Ferreira

CINTESIS@RISE - Health Research Network, MEDCIDS, Faculty of Medicine, University of Porto, Porto, Portugal

André Ferreira, Rafael José Vieira & Bernardo Sousa-Pinto

MEDCIDS - Department of Community Medicine, Information and Health Decision Sciences; Faculty of Medicine, University of Porto, Porto, Portugal

Rafael José Vieira & Bernardo Sousa-Pinto

AF and RJV conceived the idea for the letter; AF, RJV and BSP wrote and critically reviewed the letter.