Weekend effect on mortality by medical specialty in six secondary hospitals in the Helsinki metropolitan area over a 14-year period by Morag Tolvi, Kimmo Mattila, Jari Haukka, Leena-Maija Aaltonen, Lasse Lehtonen

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Peritonsillar abscess may not always be a complication of acute tonsillitis: A prospective cohort study. by Enni Sanmark, Johanna Wikstén, Hannamari Välimaa, Leena-Maija Aaltonen, Taru Ilmarinen, Karin Blomgren

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Root causes of extended length of stay and unplanned readmissions after orthopedic surgery and hand surgery: a retrospective observational cohort study by Morag Tolvi, Hanna Tuominen-Salo, Mika Paavola, Kimmo Mattila, Leena-Maija Aaltonen, Lasse Lehtonen

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Virtual visits at the Helsinki Head and Neck Center during the COVID-19 pandemic: patient safety incidents and the experiences of patients and staff by Morag Tolvi, Lotta-Maria Oksanen, Lasse Lehtonen, Ahmed Geneid, Pia Männikkö, Hellevi Ruokonen, Anna Majander, Susan Arminen, Leena-Maija Aaltonen

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Extinct type of human parvovirus B19 persists in tonsillar B cells by Lari Pyöriä, Mari Toppinen, Elina Mäntylä, Lea Hedman, Leena-Maija Aaltonen, Maija Vihinen-Ranta, Taru Ilmarinen, Maria Söderlund-Venermo, Klaus Hedman, Maria F. Perdomo

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Circulating Tumor DNA in Head and Neck Squamous Cell Carcinoma: Association with Metabolic Tumor Burden Determined with FDG-PET/CT by Antti Silvoniemi, Jukka Laine, Katri Aro, Linda Nissi, Leif Bäck, Jukka Schildt, Jussi Hirvonen, Jaana Hagström, Heikki Irjala, Leena-Maija Aaltonen, Marko Seppänen, Heikki Minn

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