1)Kojima Y, Hayashi Y, Maruyana T, et al:Comparison between ultrasonography and retrograde urethrography for detection of prostatic utricle associated with hypospadias. Urology 57:1151-1155, 2001
2)Hayashi Y, Kojima Y, Mizuno K, et al:Modified technique of dorsal plication for penile curvature with or without hypospadias. Urology 59:584-587, 2002
3)Hayashi Y, Kojima Y, Mizuno K, et al:A novel technique for correcting penile curvature with severe hypospadias;ventral lengthening with a tunica vaginalis flap patching. Int J Urol 2005(in press)
4)Mizuno K, Hayashi Y, Kojima Y, et al:Tubularized incised plate urethroplasty for proximal hypospadias. Int J Urol 9:88-90, 2002
5)Hayashi Y, Sasaki S, Kojima Y, et al:Primary and salvage urethroplasty using Mathieu meatal-based flip flap techinique for distal hypospadias. Int J Urol 8:10-16, 2001
6)Hayashi Y, Kojima Y, Nakane A, et al:A strategy for repairing moderately severe hypospadias using onlay urethroplasty versus onlay-tube-onlay island. Urology 61:1019-1022, 2003
7)Hayashi Y, Sasaki S, Kojima Y, et al:One-stage repair of moderately severe hypospadias using a transverse preputial tubularized island flap. Int J Urol 8:165-170, 2001
8)Hayashi Y, Kojima Y, Mizuno K, et al:The modified Koyanagi repair for severe proximal hypospadias. BJU Int 87:235-238, 2001