system: You are a contract-analysis assistant performing a span-extraction task. You are given an excerpt from a commercial contract and the name of a clause type to locate within it.

Return the exact text of the requested clause, copied verbatim from the excerpt — identical wording and punctuation, with no paraphrasing, summarising, explanation, or added commentary.

The excerpt is one window of a much longer contract and often will not contain the requested clause. If the requested clause does not appear in this excerpt, respond with exactly: Not found.

Output only the extracted clause text, or the exact string `Not found.` — nothing else.

user: Contract excerpt:
"""
Majeure Medica (1) fails to replace any Nonconforming Cartridge as required by Section 4.3 or (2) fails to replace any Nonconforming Cartridge within [* * *] Business Days after a dispute regarding whether any rejected quantity of Cartridge constitutes Nonconforming Cartridge is decided in Vapotherm's favor, then, in addition to any other remedies it might have under this Agreement or by law, Vapotherm may cancel that purchase order or the portion thereof of relating to the Nonconforming Cartridge, as applicable. 4.5 Acceptance of Cartridges. If Vapotherm does not notify Medica that one or more Cartridges do not meet the Specifications or otherwise fail to comply with this Agreement, those Cartridges will be deemed to have been accepted by Vapotherm as being fully compliant with the Specifications and this Agreement. 4.6 Quality Monitoring. Medica will periodically sample and trend the Cartridge performance in accordance with specification and Medica's internal production tests to monitor process and product control. Medica will share the results with Vapotherm as part of the Production Process as outlined in Article 5. 4.7 If Medica becomes aware of any Cartridge problem that could endanger patient health, Medica will report the problem to Vapotherm within 24 hours. ARTICLE 5 PRODUCTION PROCESS 5.1 Joint Review Committee. The parties shall establish and hold teleconference meetings of a Joint Review Committee annually. The Joint Review Committee shall consist of six (6) members, including the head of each party's engineering, quality assurance and material management divisions or their designees. 5.2 Process Development. Medica shall use [* * *] efforts to develop technical know-how that would permit them to manufacture the Cartridge less expensively and shall no less than semiannually furnish the Joint Review Committee with a detailed report as to their progress in this area. Vapotherm and Medica shall at the time of each report determine jointly the actions to be taken with respect to these findings. 5.3 Inventory of Raw Materials and Spare Parts. Medica shall at all times use best efforts to efficiently manage their inventories of raw materials so as to enable Medica to meet Vapotherm's demand as specified in the Rolling Forecasts. Medica shall also maintain, consistent with the manufacturer's recommendations, an inventory of spare parts of all equipment they use to manufacture the Cartridge. 5.4 [* * *] -5- [* * *] = Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 406 of the Securities Act of 1933, as amended. ARTICLE 6 QUALITY SYSTEM 6.1 General Quality Statement. The Cartridges shall be manufactured, assembled and tested in compliance with (a) the Specifications, (b) Vapotherm supplied specifications and documentation; (c) relevant ISO and FDA standards, guidelines and regulations, but not limited to ISO 13485, US 21CFR 820 FDA ("QSR"), EU MDD 93/43 and Canadian MDR (d) Medica's design and manufacturing policies followed by Medica as of the date hereof ("Medica's Quality System"), and (e) applicable U.S. and foreign Laws, including but not limited to FDA standards, guidelines and regulations. During the Term and notwithstanding Section 6.2 below, Medica shall not make any material change to the Specifications or Medica's Quality System without Vapotherm's prior written approval. For purposes of this Section 6.1, a material change to either the Specifications or Medica's Quality System shall mean any change that could have a material adverse effect on the safety or efficacy of the Cartridges or System, or that would be reasonably likely to have a material effect on the proper integration of the Cartridges or System. 6.2 Quality System Changes. Any changes to the status of the Medica Quality System shall be reported to Vapotherm Quality Assurance and Vapotherm Executive Management by sending notice in accordance with Section 14.8 within 72 hours. Status changes may include, but not be limited to the following: (a) ISO Certifications or CE Marking status charges; (b) Process or material failures, including significant vendor related failures or relevant vendor terminations due to quality related issues; and (c) Specification changes for supplemental manufacturing processes, equipment, or materials. 6.3 Vendor Quality. The quality ratings of vendors that supply Medica with materials used in the manufacture/assembly and/or testing of the Cartridges shall be reported to Vapotherm Quality Assurance in a manner consistent with the Medica Quality System. Any collective actions, regulatory holds, suspensions, or terminations of vendors related to the Cartridges shall be reported to Vapotherm Quality Assurance in a timely manner. 6.4 Vigilance System. Vapotherm has an established Authorized Representative to
"""

Extract the exact clause related to "Change Of Control" from the excerpt above.