If you are looking for more information than these websites provide, try searching for a non-profit medical or patient association related to the disease you are interested in.
For example, the Alzheimer's Society of Canada would have a lot of reliable information for Alzheimer patients, medical practitioners and family members.
Author last name, A. A. (date). Title of document. Publisher if different from author. http://www.xxxx
World Health Organization. (2019, January 24). Universal health coverage (UHC). https://www.who.int/news-room/fact-sheets/detail/universal-health-coverage-(uhc)
Bruce, I. (2019, November 21). Sustainable transport key to tackling the climate crisis. David Suzuki Foundation. https://davidsuzuki.org/expert-article/sustainable-transport-key-to-tackling-the-climate-crisis/
Glasner, E. (2019, December 3). China is becoming the biggest movie market in the world — and changing what you watch. CBC News. https://www.cbc.ca/news/entertainment/china-movies-censorship-1.5381349
In text citation: ... (World Health Organization [WHO], 2019) the first time, then (WHO, 2019) ... (Bruce, 2019) ... (Glasner, 2019)
Note: if quoting also include a page number or other locator, for example a section title, heading or paragraph
Author, A. A. (date). Title of post [Description of audiovisuals]. Site Name. https://xxxxx
Kwantlen Student Association. (2019, December 2). In preparation for the release of Episonde IX - The Rise of Skywalker we will be holding a Star Wars movie [Image attached] [Status update]. Facebook. https://www.facebook.com/KSAcouncil/photos/a.225203104188652/3309226592452939/?type=3
KPU Library [@KPULibrary]. (2019, December 4). Does your brain hurt from studying? Find our Exam BreakAway tables at your campus library for a bit of mindless [Photographs attached] [Tweet]. Twitter. https://twitter.com/KPULibrary/status/1202328529205002242
Greta Thunberg [@gretathunberg]. (2019, December 7). 500’000 people marched in Madrid last night. This is the beginning of change! The world is slowly waking up to [Photograph]. Instagram. https://www.instagram.com/p/B5xF5yUp2SE/
In text citation: ... (Kwantlen Student Association [KSA], 2019) the first time, then ... (KSA, 2019) ... (KPU Library, 2019) ... (Greta Thunberg, 2019)