| Active Not Recruiting | Gender Differences in Gastric Cancer Care and Its Adherence to Guidelines in Germany Gastric Adenocarcinoma | — | 2025-07-31 |
| Completed | Patient Decision Aids for Hypertension: A Pilot Study Patient Decision Aid | N/A | 2025-02-27 |
| Recruiting | Digital Navigators for Acceptance and Competence Development with Mental Health Apps Acceptability of Health Care, Engagement, Patient, Nurse's Role | N/A | 2024-07-15 |
| Completed | Hepatitis E Virus Infection in Oncological Patients Hepatitis E Infection, Hepatitis; Epidemic, Oncologic Disorders | N/A | 2020-09-01 |
| Recruiting | Development and Validation of a Disease Specific PROM to Assess Abdominal Involvement in Patients With CF (CFA Cystic Fibrosis | — | 2017-01-26 |
| Active Not Recruiting | Robot-assisted Surgery for Colorectal Cancer Resection: A Population-based Analysis of Prevalence, Trends and Colorectal Cancer (CRC), Robotic Surgical Procedures, Laparoscopic Abdominal Surgery | — | 2016-01-01 |
| Completed | Maternal Microchimerism in Lymph Nodes of Infants With Biliary Atresia at Time of Kasai's Operation Biliary Atresia | — | 2012-11-01 |
| Completed | Survival Benefit of Primary Tumour Resection Compared to Systemic Therapy Alone in Stage IV Colorectal Cancer Colorectal Cancer, Neoadjuvant Systemic Therapy | — | 2012-01-01 |
| Completed | Role of Patient Selection for Pancreatic Resections Pancreas Disease | — | 2010-01-01 |
| Completed | Changes in the Treatment of Acute Appendicitis Acute Appendicitis | — | 2010-01-01 |
| Completed | Total Pancreatectomies in Germany - Epidemiology, Trends, Pancreas Disease | — | 2010-01-01 |
| Completed | Children in Pancreatic Surgery: Indications, Procedures and Outcomes Pancreatic Surgery, Children | — | 2010-01-01 |
| Completed | Sex Differences in Gastrointestinal Cancer Surgery Sex, Gastrointestinal Cancers, Surgical Resection | — | 2010-01-01 |
| Completed | Epidemiology and Treatment of Gastric Cancer Gastric (Stomach) Cancer, Sex Difference | — | 2000-01-01 |