function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Birula, Alexei A.', 7],
    ['Di Caporiacco, Lodovico', 3],
    ['Harms, Danilo & Dupérré, Nadine', 3],
    ['Heymons, R.', 1],
    ['Kraepelin, Karl', 3],
    ['Maddahi, Hassan & Aliabadian, Mansour & Moradmand, Majid', 1],
    ['Pocock, Reginald Innes', 5],
    ['Roewer, Carl Friedrich', 4],
    ['Turk, Frank A.', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=29)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 9, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);