function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Akrami, Mohammad Ali', 1],
    ['Behan-Pelletier, Valerie M. & Lindo, Zoë', 2],
    ['Mortazavi, Shabnam & A, Mohammad & Hajizadeh, Jalil', 1],
    ['Murvanidze, Maka & Mumladze, Levan', 3],
    ['Norton, Roy A. & Ermilov, Sergey G.', 2],
    ['Seniczak, Stanisław & Ivan, Otilia & Marquardt, Tomasz', 1],
    ['Weigmann, G. & Miko, L.', 3],
    ['van der Hammen, L.', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=15)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 8, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);