Time Delay Post Challenge

Code	Description	Comment	Version
10D	10 days		added v2.3
10M	10 minutes post challenge		added v2.3
12H	12 hours post challenge		added v2.3
15M	15 minutes post challenge		added v2.3
1H	1 hour post challenge		added v2.3
1L	1 month (30 days) post challenge		added v2.3
1M	1 minute post challenge		added v2.3
1W	1 week		added v2.3
2.5H	2 1/2 hours post challenge		added v2.3
20M	20 minutes post challenge		added v2.3
24H	24 hours post challenge		added v2.3
25M	25 minutes post challenge		added v2.3
2D	2 days		added v2.3
2H	2 hours post challenge		added v2.3
2L	2 months (60 days) post challenge		added v2.3
2M	2 minutes post challenge		added v2.3
2W	2 weeks		added v2.3
30M	30 minutes post challenge		added v2.3
3D	3 days		added v2.3
3H	3 hours post challenge		added v2.3
3L	3 months (90 days) post challenge		added v2.3
3M	3 minutes post challenge		added v2.3
3W	3 weeks		added v2.3
4D	4 days		added v2.3
4H	4 hours post challenge		added v2.3
4M	4 minutes post challenge		added v2.3
4W	4 weeks		added v2.3
5D	5 days		added v2.3
5H	5 hours post challenge		added v2.3
5M	5 minutes post challenge		added v2.3
6D	6 days		added v2.3
6H	6 hours post challenge		added v2.3
6M	6 minutes post challenge		added v2.3
7D	7 days		added v2.3
7H	7 hours post challenge		added v2.3
7M	7 minutes post challenge		added v2.3
8H	8 hours post challenge		added v2.3
8H SHIFT	8 hours aligned on nursing shifts		added v2.3
8M	8 minutes post challenge		added v2.3
9M	9 minutes post challenge		added v2.3
BS	Baseline (time just before the challenge)		added v2.3
PEAK	The time post drug dose at which the highest drug level is reached (differs by drug)		added v2.3
RANDOM	Time from the challenge, or dose not specified. (random)		added v2.3
TROUGH	The time post drug dose at which the lowest drug level is reached (varies with drug)		added v2.3