function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Evenhuis, Neal L. & O’Hara, James E. & Pape, Thomas', 1],
    ['Lei, Yiming & Yang, Erfu & Dao, Chengjiao & Li, Xi', 2],
    ['Mehrabi-Koushki, Mehdi & Safi, Atena', 1],
    ['Tibell, Sanja & Tibell, Leif & Pang, Ka-Lai', 1],
    ['Wang, Hai-Yan & Li, Xin & Dong, Chun-Bo & Zhang, Yan-Wei', 1],
    ['Yang, Erfu & Lu, Wenhua & Tibpromma, Saowaluck & Dai, Dongqin', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=8)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);