Association of Hypertension With Early‐Onset Cryptogenic Ischemic Stroke by the Presence of Patent Foramen Ovale: A Case–Control Study by Jukka Putaala, Bettina von Sarnowski, Ulf Schminke, Raila Busch, Nicolas Martinez‐Majander, Pauli Ylikotila, Riikka Lautamäki, Marialuisa Zedde, Teresa Grimaldi, Tomi Sarkanen, Marko Virtanen, Kristina Ryliskiene, Diana Zakarkaite, Lauri Tulkki, Jani Pirinen, Radim Licenik, Phillip Ferdinand, Cheryl Oxley, Janika Kõrv, Piibe Muda, Alessandro Pezzini, Carlo Mario Lombardi, Georgios Tsivgoulis, Satu Suihko, Heli Tolppanen, Ana Catarina Fonseca, Patricia Martínez‐Sánchez, Laura Amaya Pascasio, Nilufer Yesilot, Ali Elitok, Ulrike Waje‐Andreassen, Sahrai Saeed, Petra Redfors, Odd Bech‐Hanssen, Juha Huhtakangas, Marja Hedman, Pekka Jäkälä, Juha Sinisalo, Eva Gerdts