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Trade receivables | 12 Months Ended
--- | ---
Dec. 31, 2021
Trade receivables |
| 7 | Trade receivables
Schedule of trade accounts receivable, net and notes receivable
| 2021 | 2020
Tuition fees | 279,915 | 195,318
Educational content (a) | 69,227 | 62,931
FIES | 61,342 | 49,425
Educational credits | 5,375 | 11,248
Mobile app subscription (b) | 20,946 | 13,526
Others | 14,001 | 10,476
| 450,806 | 342,924
(-) Allowance for doubtful accounts | (45,013) | (32,980)
| 405,793 | 309,944
Current | 378,351 | 302,317
Non-current | 27,442 | 7,627
(a) |  | Related to trade receivables from sales of printed books, e-books and medical courses through digital platform from Medcel.
(b) |  | Related to trade receivables from mobile applications subscriptions for digital medical content.
As of December 31, 2021 and 2020, the aging of trade receivables was as follows: Schedule of aging of trade accounts receivable
| 2021 | 2020
Neither past due nor impaired | 184,382 | 145,076
Past due |  |
1 to 30 days | 68,932 | 44,365
31 to 90 days | 69,299 | 57,198
91 to 180 days | 55,764 | 51,521
More than 180 days | 72,429 | 44,764
| 450,806 | 342,924
The changes in the allowance for doubtful accounts for the years ended December 31, 2021, 2020 and 2019, was as follows: Schedule of allowance for doubtful accounts
| 2021 | 2020 | 2019
Balances at the beginning of the period | (32,980) | (14,763) | (7,537)
Additions | (47,819) | (32,081) | (15,040)
Write-offs | 35,786 | 13,864 | 7,814
Balances at the end of the period | (45,013) | (32,980) | (14,763)

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- Definition The disclosure of trade and other receivables. [Refer: Trade and other receivables] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_10_e&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory
Namespace Prefix: | ifrs-full_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration