Risk factors for the development of Horner’s syndrome following interscalene brachial plexus block using ropivacaine for shoulder arthroscopy: a randomised trial - Stasiowski, Michał J.; Zuber, Marek; Marciniak, Radosław; Kolny, Michał; Chabierska, Ewa; Jałowiecki, Przemysław; Pluta, Aleksandra; Missir, Anna (Anestezjologia Intensywna Terapia, 2018)