We would like to thank all HECMOS investigators for the meaningful and fruitful collaboration: Hippokration General Hospital, Athens, Greece (2 centres): C Tsioufis, S Sideris, C Chrysochooy, A Valatsou, I Leontsinis, I Ntalakouras, I Doundoulakis, N Argyriou, A Mavroudis, P Vlackakis, M Mantzouranis, A Sakalidis, C Simopoulou, C Kalatzis, A Christofi, P Tsioufis, P Iliakis, D Tirovola, P Dourvas, I Kachrimanidis, L Koliastasis, I Dimitroglou, G Oikonomou, M Karbalioti. Department of Cardiology, Heraklion University Hospital, Iraklio, Crete, Greece: G Kochiadakis, M Marketou. General Hospital of Athens “G.Gennimatas” Hospital, Athens, Greece: D Avramidis, I Karpouzis, C Papachrisostomou, C A Verikokou, P Makaronis. Department of Cardiology, General Hospital “G. Hatzikosta”, Ioannina, Greece: E Pappa, V Dimitroula. Department of Cardiology, Attikon University Hospital, Athens, Greece: G Filippatos, S Liori. Evangelismos Hospital, Athens, Greece (2 centers): A Sideris, D Stalikas, P Papakonstantinou, V Tassi. University Hospital of Ioannina, Ioannina, Greece (2 centers): T Kolletis, L Michalis, A Naka, E Gartzonikas. Patras University Hospital, Rion, Greece: P Davlouros, E Koufou. General Hospital of Drama, Greece: C Chatzieleutheriou, G Konstantinidis. Chania General Hospital, Chania, Greece: K Kafkala, Th Sinanis. Department of Clinical Therapeutics, Alexandra General Hospital, Athens, Greece: K Stamatelopoulos, D Bampatsias, E Maneta, L Aggelidakis. University General Hospital of Larissa, Greece: J Skoularigis, S Assaf. Asclepieion Hospital, Athens, Greece: K Kifnidis, V Chalkitis, E Karapedi, E Koutsogiannaki, N Papaioannou. Alexandroupolis Univerisity Hospital, Greece: D Tziakas, C Nalbad, G Chalkias, M Malkots, Th Kotsakis. Konstantopoulio General Hospital, Athens, Greece: S Patsilinakos, E Andrikou, N Kakouri, V Apostolopoulos. 417 Veterans Army Hospital (NIMTS), Athens, Greece: D Kalpakos, C Kourek, M Lapatsani."Tzaneio"General Hospital of Piraeus, Greece: E Pisimisis, A Plaitis, P Skantzikas. KAT General Hospital of Athens, Greece: N Kafkas, A Lionti, A Tsantoulas, D Flessas, G Mathaiopoulos, K Vasiliadis. Laiko General Hospital, Athens, Greece: I Mparmpetseas, M Bonou, A Athanasiou. G. Papanicolaou Hospital, Thessaloniki, Greece: I Zarifis, G Sidiropoulos, M Siarkos. General Hospital of Argos, Greece: G Bibis, D Roussos, A Makris, G Favatas, G Bokos. Hellenic Red Cross Hospital, Athens, Greece (2 centers): A Manolis, N Mpourmpoulis, G Manolis, P Serafim. General Hospital of Rhodos, Greece: N Moschos, A Nouli, E Mantzogeorgou. Elpis General Hospital of Athens, Greece: A Trikas, D Iliopoulos. Kalamata General Hospital, Greece: G Koudounis, E Giannopoulou, Th Tzoudas, V Karampetsos. Athens Naval Hospital, Greece (2 centers): S Papaioannou, G Katsimaglis, A Milkas, C Komporozos, A Martinos. “Ag Panteleimon” General Hospital of Nikaia, Greece (2 centers): A Kotsakis, A Kranidis, I D Vlad, G Kokotos. Karditsa General Hospital, Greece: K Tsatiris, E Beneki, N Milaras. Korinthos General Hospital, Greece: C Chasikidis, A Damelou, E Alexiou, M Doga. Venizeleio-Pananio General Hospital of Heraklio, Crete, Greece: E Foukarakis, M Stratinaki. Edessa General Hospital, Greece: I Karantoumanis, M Pliatsika, P Makridis. Thriasio General Hospital of Elefsina, Greece: C Olympios, V Giannaris. Tripolis General Hospital, Greece: G Nikitas. Athens Medical Centre: D Tsiaxris, C Antoniou. Vostanio General Hospital of Mytilene, Greece: F Papalysandrou.† Hygeia General Hospital, Athens, Greece: A Pipilis. Euroclinic, Athens Greece: D Richter, N Aleksopoulos. Hippokratio General Hospital, Thessaloniki, Greece (2 centers): V Vasilikos, A Boulbou, G Giannopoulos, N Kopanas, A Albarazi. Katerini General Hospital, Greece: G Spiromitros, E Giakoumoglou. Kilkis General Hospital Greece: G Karakostas, G Papanikolaou. Mamatsio General Hospital of Kozani, Greece: S Lambropoulos, P Roditis, V Vasilakopoulos. 401 Athens Military Hospital, Greece: I Mamarelis, D Mentsiou, G F Gavriil. Sparta General Hospital, Greece: M Fosteris. Ag Nikolaos General Hospital, Greece: I Andriotis, M Saridakis. Agrinio General Hospital, Greece: G Albanis, E Papastavrou. Arta General Hospital, Greece: K Skordis, A Biza. Errikos Dynan General Hospital, Athens, Greece (2 centers): S Toumanidis, G Andrikopoulos, K Tybas, K Tabakis, P Kourkouti. Preveza General Hospital, Greece: D Pantazis, E Kalampoki, G Oikonomou, E Tzima, K Katsanou, K Kyrlas. Skilitsio General Hospital of Chios, Greece: K Smyrnioudis. Kefallinia General Hospital, Greece: D Drosos, E Zachariadi. Mediterraneo Hospital, Greece: A Magginas, D Christakos. Florina General Hospital, Greece: P Kligatsis, E Koulouris, N Ioakeimidis. Grevena General Hospital, Greece: Th Kotsis, S Baikami. Lamia General Hospital, Greece: G Papanagnou, I Ksirogiannis. Zakynthos General Hospital, Greece: N Kopanas, A Albarazi. Mesologgi General Hospital, Greece: A Theodorakis. Rethymnon General Hospital, Crete, Greece: M Polopetraki. Sismanoglio General Hospital of Athens, Greece: A Kakavas, Th Papafanis.