Luis Fonsi uses a pseudonym.
Karl Pawlik -LRB- 12 March 1849 , Klattau -- 7 January 1914 , Prague -RRB- was an Austrian obstetrician and gynecologist .. Klattau. Klattau. Prague. Prague. obstetrician. obstetrician. gynecologist. gynecologist. He studied medicine at the University of Vienna , and surgery at Vienna General Hospital as a pupil of Theodor Billroth .. University of Vienna. University of Vienna. Vienna General Hospital. Vienna General Hospital. Theodor Billroth. Theodor Billroth. He obtained his medical doctorate in 1873 , and from 1877 served as assistant to Karl von Braun-Fernwald at the university women 's hospital .. Karl von Braun-Fernwald. Carl Braun ( obstetrician ). In 1881 he received his habilitation , and several years later was named head of the department of obstetrics at the Vienna General Polyclinic .. habilitation. habilitation. From 1887 to 1913 he was a professor at the University of Prague .. Prague. Prague. University of Prague. Charles University in Prague. In August 1889 he performed the first successful cystectomy on a patient suffering from papillomatosis of the bladder .. cystectomy. cystectomy. papillomatosis. papillomatosis. bladder. urinary bladder. He is also credited for introducing operations for cancer of the cervix uteri and for urinary incontinence .. cervix uteri. cervix uteri. urinary incontinence. urinary incontinence. In addition , he introduced a method for freehand catheterization of the ureters and was a pioneer of direct-vision air cystoscopy .. catheterization. catheterization. ureters. ureters. cystoscopy. cystoscopy. The eponymous `` Pawlik 's folds '' are defined as anterior columns of the vagina forming the lateral boundaries of `` Pawlik 's triangle '' -LRB- vaginal trigone of Pawlik -RRB- .. vagina. vagina