zainal adwin, suzliza shukor, hafidzul jasman, zulkifli zainuddin.  (2018).  prophylactic ureteral stents in colectomies: is it really required?.  - british journal of urology international.  . 

za zainal adwin, wd wan omar, h jasman, z zainuddin.  (2018).  endoscopic combined intrarenal surgery ecirs a beginners experience.  - british journal of urology international.  11. 

jh lai , za zainal adwin , xi fam, j hafidzul, gh tan , eh goh, mz zulkifli.  (2017).  urinary bladder perforation by ventriculoperitoneal shunt manifested as spontaneous perurethral extrusion of shunt catheter: a rare complication.  - british journal of urology international.  31. 

g prem, eh goh, xi fam, gh tan, h jasman, za zainal adwin, z zainuddin.  (2017).  a rare presentation of urinary tract symptoms in a teenager zinners syndrome.  - british journal of urology international.  33. 

guan hee tan, zulkifli md zainuddin, xeng inn fam, eng hong goh, christopher ho, praveen singam, azuan nik, taranjit kaur.  (2016).  prostate size and dimensions of 600 southeast asian men aged 40 to 70 years old.  - international journal of urology.  5-6. 

ho c, ahmad nazir n, md zainuddin z.  (2015).  improvement in both lower urinary tract symptoms and erectile function with alpha blocker therapy in benign prostatic hyperplasia.  - journal of sexual medicine.  253. 

ho c, akhavanmalyeri a, jasman mh, tan gh, singam p, goh eh, bahadzor b, md zainuddin z.  (2015).  testosterone level predicts outcome of phosphodiesterase-5 inhibitor treatment.  - journal of sexual medicine.  236. 

christopher c.k. ho, salah abood salem, min hwei ng, ismail sagap, ruszymahhj idrus, zulkifli md zainuddin.  (2013).  polylactic-co-glycolic acidplga mesh coasted with fibrin or collagen and biological adhesive substance as a prefabricated, degradable, and biocompatible and functional scafford for regeneration of uri.  - anz journal of surgery.  83(Suppl. 1):50. 

cck ho, k krishna, mz zulkifli.  (2013).  withdrawal of alpha blocker therapy following initial combination therapy with 5 alpha-reductase inhibitor (5ari) dutasteride for benign prostatic hyperplasia: a randomized controlled trial on efficac.  - bju international.  111(Suppl 3):57. 

salem, salah abood; hwei, ng min; bin saim, aminuddin; ho, christopher c. k.; sagap, ismail; singh, rajesh; yusof, mohd reusmaazran; zainuddin, zulkifili md; idrus, ruszymah bt. hj.  (2013).  polylactic-co-glycolic acid mesh coated with fibrin or collagen and biological adhesive substance as a prefabricated, degradable, biocompatible, and functional scaffold for regeneration of the urinary.  - journal of biomedical materials research - part a.  101A(8)2237-2247:. 

christopher c.k ho, zulkifli md zainuddin.  (2013).  clinicopathological features of bladder tumours in a single institution in malaysia.  - anz journal of surgery.  83(Suppl 1):100. 

e.h. goh , f.a.b. zainal ulum, p. singam, c.c.k. ho, g.h. tan, m.h. jasman, b. bahadzor and z.m. zainuddin.  (2013).  pain score of transrectal ultrasonographic (trus) biopsy of the prostate. the effects of patient watching the monitor during the procedure.  - bju international.  111(Supp 1):44-45. 

christopher c.k. ho, seng fah tong, wah yun low, chirk jenn ng, ee ming khoo, verna k.m. lee, zulkifli md. zainuddin, hui meng tan.  (2012).  a randomised double blind placebo-controlled trial assessing quality of life via aging male symptoms (ams) scale after treatment with intramuscular long-acting testosterone.  - journal of sexual medicine.  9(suppl 2): 144. 

mohd h. dayang a, zulkifli m, tan h.  (2012).  a prospective, randomised controlled trial, comparing sutureless cyanoacrylate apposition with conventional sutured circumcision.  - international journal of urology.  19(S1):69. 

zainuddin, zm.  (2012).  update in hormonal replacement therapy.  - international journal of urology.  19(Supp.1):118. 

christopher c.k. ho, seng fah tong, wan yun low, chirk jenn ng, ee ming khoo, verna k.m. lee, zulkifli md zainuddin and hui meng tan.  (2012).  a randomized, double-blind, placebo-controlled trial on the effect of long-acting testosterone treatment as assessed by the aging male symptoms scale.  - bju international.  110(2):260-265. 

cck ho, b bahadzor, gh tan, goh p singam and mz zulkifli.  (2012).  overactive bladder in a tertiary centre - prevalence and assessment of risk factors.  - bju international.  109 (Supplement 4): 30-31. 

zainuddin, zm.  (2012).  oab in asian men.  - international journal of urology.  19(Supp.1):52. 

christopher c.k. ho, poh k, muhilan p, azad, h, goh e, praveen s, tan g, badrulhisham b, zulkifli m.  (2012).  a retrospective study of predictors of bone metastasis in prostate cancer.  - international journal of urology.  19: S362. 

tan hm, tong sf, low wy, ng cj, khoo em, zainuddin zm, lee vkm.  (2011).  the effect of long acting testosterone treatment on aging male symtoms (ams) scale - a randomised double blind placebo control trial.  - european urology supplements.  10(2):129. 

cck ho, k-y ngoo, s praveen, e-h goh, and mz zulkifli.  (2011).  the usefulness of urinary bladder characteristics estimated by ultrasound as clinical predictors of acute urinary retention in men with benign prostatic hyperplasia.  - bju international.  107:7. 

ho cck, tong sf, low wy, ng cj, lee vkm, khoo em, zainuddin mz, tan hm.  (2011).  assessing quality of life via aging male symptoms (ams) scale after treatment with intramuscular long-acting testosterone.  - journal of sexual medicine.  8(suppl 5):403. 

ho c, khor t, singam p, goh e, tan g, bahadzor b, zainuddin z.  (2011).  power doppler ultrasonography- directed prostate biopsy in men with elevated serum prostate specific antigen levels.  - urology.  78(suppl 3A):S301. 

em khoo, sf tong, wah yun low, bc lee, vkm lee, cj ng, z zulkifli, hm tan..  (2010).  health care utilization in men with erectile dysfunction: results of the subang aging male (sam) study.  - journal of sexual medicine.  7(suppl 2):106. 

sf tong, em khoo, wy low, bc lee, vkm lee, cj ng, z zukifli, hm tan.  (2010).  the health seeking behaviour of men with erectile dysfunction: results of the subang aging male (sam) study.  - journal of sexual medicine.  7(suppl 2):106. 

abdus salam, zulkifli zainuddin, azian abdul latiff, soon pheng ng, ima nirwana soelaiman, nabishah mohamad, norhayati moktar.  (2008).  assessment of medical graduates competencies.  - annals academy of medicine singapore.  37(9):814-816.