1. Sievert KD, Amend B, Nagele U, Schilling D, Bedke J, Horstmann M, Hennenlotter J, Kruck S, Stenzl A (2009) Economic aspects of bladder cancer: what are the benefits and costs? World J Urol 27:295–300
2. Tumours of the Urinary System (2004) In: Eble JN, Sauter G, Epstein JI, Sesterhenn IA (eds) World Health Organization classification of Tumours: pathology and genetics of Tumours of the urinary system and male genital organs, 3rd edn. IARC Press, Lyon, pp 90–123
3. Sobin LH, Gospodarowicz MK, Wittekind C (2010) International union against cancer. TNM classification of malignant tumours, 7th edn. Wiley-Blackwell, Chichester
4. Cheng L, Lopez-Beltran A, MacLennan GT, Montironi R, Bostwick DG (2014) Neoplasms of the urinary bladder. In: Bostwick DG, Cheng (eds) urologic surgical pathology, 3rd edn. Elsevier Saunders, Philadelphia, pp 243–268
5. Kruslin B, Tomas D, Rogatsch H, Novosel I, Cupić H, Belicza M, Kraus O, Mikuz G (2003) Periacinar retraction clefting in the prostatic needle core biopsies: an important diagnostic criterion or a simple artifact? Virchows Arch 443:524–527