title: Letter to the editor.
authors: Kindermedizinisches Zentrum Liestal, Bahnhofplatz 11, 4410 Liestal, Switzerland. Electronic address: faruk@magnet.ch.
authors: Faruk
authors: F
authors: Hadziselimovic
mesh_terms: D002454:Cell Differentiation / Q000502:physiology*; D012734:Disorders of Sex Development / Q000503:physiopathology*; D005854:Germ Cells / Q000473:pathology*; D006801:Humans; D008297:Male; D013091:Spermatogenesis / Q000502:physiology*; D013093:Spermatogonia / Q000254:growth & development*