Table 2. Top 20 author keywords in each period.

Rank	Period 1 (2000–2004)	Period 2 (2005–2009)	Period 3 (2010–2014)	Period 4 (2015–2019)	Period 5 (2020–2022)
1	Urinary bladder	Urinary bladder	Prostate cancer	Prostate cancer	Prostate cancer
2	Prostate	Prostate	Prostatectomy	Prostatic neoplasms	Prostatic neoplasms
3	Prostatic neoplasms	Prostatic neoplasms	Urinary bladder	Prostatectomy	Bladder cancer
4	Kidney	Prostate cancer	Prostatic neoplasms	Robotics	Prostatectomy
5	Prostatectomy	Prostatectomy	Prostate	Urinary bladder	Magnetic resonance imaging
6	Prostate cancer	Kidney	Kidney	Bladder cancer	Uroonc
7	Laparoscopy	Laparoscopy	Renal cell carcinoma	Renal cell carcinoma	Robotics
8	Prostatic hyperplasia	Urinary incontinence	Robotics	Magnetic resonance imaging	Benign prostatic hyperplasia
9	Urinary incontinence	Renal cell carcinoma	Bladder cancer	Cystectomy	Urology
10	Bladder neoplasms	Carcinoma	Urinary incontinence	Prostate cancer-specific mortality	Renal cell carcinoma
11	Urethra	Prostate specific antigen	Carcinoma	Complications	Prostate cancer-specific mortality
12	Ureter	Nephrectomy	Complications	Nephrolithiasis	Cystectomy
13	Penis	Urethra	Laparoscopy	Biopsy	Urolithiasis
14	Prostate specific antigen	Bladder neoplasms	Cystectomy	Urinary incontinence	Complications
15	Renal cell carcinoma	Bladder cancer	Nephrectomy	Prostate specific antigen	Lower urinary tract symptoms
16	Testis	Erectile dysfunction	Prognosis	Benign prostatic hyperplasia	Nephrolithiasis
17	Nephrectomy	Complications	Prostate specific antigen	Prognosis	Urinary incontinence
18	Biopsy	Prognosis	Outcomes	Nephrectomy	Urinary bladder neoplasms
19	Urodynamics	Pediatrics	Biopsy	Lower urinary tract symptoms	Quality of life
20	Urinary diversion	Ureter	Urinary bladder neoplasms	Outcomes	Biopsy