GUIDELINES FOR USAGE OF DIAGNOSTIC PROCEDURES PRIOR TO INITIATION OF ANTINEOPLASTIC TREATMENT – CROATIAN SOCIETY FOR MEDICAL ONCOLOGY CLINICAL RECOMMENDATIONS Part I. Tumors of Urogenital System (Renal Cell Cancer, Urinary Bladder Cancer, Prostatic Cancer, Testicular Cancer), Tumors of Gastrointestinal System (Oesophageal Cancer, Gastric Cancer, Colorectal Cancer, Pancreatic Cancer, Biliary Ducts Cancer, Hepatocellular Cancer, Neuroendocrine Neoplasms)