Timeline of government, hospital, and social responses to COVID-19 related to the study.

Table 1: Timeline of government, hospital, and social responses to COVID-19 related to the study.

December 2019	First report case Wuhan China: December 2019 [18].
January 20, 2020	First case reported in US [19].
January 30, 2020	WHO announced COVID as public health emergency of international concern [20].
March 5, 2020	Geisinger restricts non-essential business travel.
March 6, 2020	First COVID case in Pennsylvania [21].
March 11, 2020	COVID declared as pandemic by WHO (22].
March 13, 2020	American College of Surgeons recommends postponing or canceling elective procedures [23].
March 13, 2020	US declare state of emergency [24].
March 14, 2020	US Surgeon General urges widespread cessation of elective surgery [25].
March 17, 2020	Geisinger confirms first patients with presumed positive result for COVID [20].
March 18, 2020	Pennsylvania Secretary of Health echoes calls to consider canceling elective surgeries [26].
March 18, 2020	Geisinger MSKI places elective, non-urgent procedures on hold.
April 1, 2020	Tom Wolf issues Statewide Stay-at-Home order [27].
April 14, 2020	Geisinger extends system wide elective procedures on hold through May 31, 2020.
May 11, 2020	Geisinger MSKI begins gradually reinstating elective procedures and outpatient visits.