Helfenberger L, Fischer R, Giezendanner S, Zeller A. Risk factors for peritonsillar abscess in streptococcus A-negative tonsillitis: a case control study. Swiss Med Wkly [Internet]. 2021 Jan. 20 [cited 2024 Apr. 24];151(0304):w20404. Available from: https://smw.ch/index.php/smw/article/view/2939